- Axioma Portfolio Optimizer’s modeling flexibility and advanced optimization techniques deliver superior results for tax-aware portfolios. Axioma Portfolio Analytics provides time-series risk analysis, stress testing, and both traditional Brinson and factor-based performance attribution, fully integrated with Axioma’s fundamental, statistical and macroeconomic risk models as well as custom.
- Any risk model that excels at one of these objectives will have severe weaknesses in some other areas. You could have multiple risk models (indeed Axioma has one for fundamentals that is easily interpretable, and another based on statistical methods for accuracy) but this can be confusing to clients.
Abstract
Risk modeling is a powerful tool that can be used to understand and manage sources of risk in investment portfolios. In this paper we lay out the logic and the implementation of the Quantopian Risk Model (QRM), an equity risk factor model developed by Quantopian to decompose and attribute risk exposures taken on by arbitrary equity investment strategies. By defining sources of risk, it is possible to consider the residual or remainder term as a strategy’s “alpha”, or the portion of an investment strategy’s return that is derived from skill. Combined with some other tools, the QRM is used by Quantopian to evaluate quantitative trading strategies on the basis of observing that strategy’s portfolio holdings over time.
Risk management considers how we can consciously determine how much risk we are willing to take in order to attain a future gain. This process involves:
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- Identifying sources of risk
- Quantifying exposure to those sources of risk
- Determining the effects of those risk exposures
- Developing a mitigation strategy
- Observing consequent performance and amending the mitigation strategy as needed
Risk comes from uncertainty regarding a portfolio’s future losses and gains and different individuals and institutions will have differing amounts of tolerance to risk. We quantify the total risk of a portfolio over (T) time periods as the standard deviation of that portfolio’s returns:
$$sigma = {sqrt{{1 over T} {sum_{l=1}^T} (r_l - bar{r})^2 }}$$
Where:
- (r_l) is the return on time (l)
- (bar{r}) is the average portfolio over (T) time periods
This is a common definition of risk that captures sufficient information for our purposes. It treats gains and losses symmetrically and can be used to evaluate each level of the portfolio, from individual assets to the portfolio itself. Standard deviation, also called volatility, gives us an idea of how close we should expect values to fall relative to the mean. A common rule of thumb is that around 68% of values lie within one standard deviation of the mean, 95% of values lie within two standard deviations of the mean, and 99% of values lie within three standard deviations of the mean. A population of observations with a low standard deviation will contain individual observations largely clustered around the population mean value, while a population of observations with a higher standard deviation can be expected to contain a larger number of extreme values, both for gains and losses. This fits with common intuition about financial returns. More extreme values go hand in hand with more volatile assets. They bring with them greater chance of both profit and ruin.
Evaluating risk is not only about evaluating the amount of potential loss. It allows us to set reasonable expectations for returns and make well-informed decisions about potential investments. Quantifying the sources of risk associated with a portfolio can reveal to what extent the portfolio is actually accomplishing a stated investment goal. If an investment strategy is described as targeting market and sector neutrality, for example, the underlying portfolio should not be achieving significant portions of its returns from a persistent long exposure to the technology sector. While this strategy may show profit over a given timeframe, understanding that those profits are earned on the basis of unintended bets on a single sector may lead the investor to make a different decision about whether and how much capital to allocate. Quantifying risk exposures allows investors and managers to create risk management strategies and refine their portfolio.
Developing a risk model allows for a clear distinction between common risk and specific risk. Common risk is defined here as risk attributable to common factors which drive returns within the equity stock market. These factors can be composed of either fundamental or statistical information about the underlying investment assets that make up the market. Fundamental factors are often observable fundamental ratios reported by companies that issue stock, such as the ratio of book value to share price, or earnings per share. These factors are typically derived from financial and macroeconomic sources of data. Statistical factors use mathematical models to explain the correlations between asset returns time-series without consideration of company- specific fundamental data (Axioma, Inc. 2011).
Some commonly-cited risk factors are the influence of an overall market index, as in the Capital Asset Pricing Model (CAPM) (Sharpe 1964), risk attributable to investing within individual sectors, which give an idea of the space a company works within, as in the BARRA risk model (BARRA, Inc. 1998), or style factors, which mimic investment styles such as investing in “small cap” companies or “high growth” companies, as in the Fama-French 3-factor model <><(fama and=' french='>(fama>.
Specific risk is defined here as risk that is unexplainable by the common risk factors included in a risk model. Typically, this is represented as a residual component left over after accounting for common risk (Axioma, Inc. 2011). When we consider risk management in the context of quantitative trading, our understanding of risk is used in large part to clarify our definition of 'alpha'. This residual after accounting for the common factor risk of a portfolio can be thought of as a proxy for or estimate of the alpha of the portfolio.
A common first introduction to factor modeling and the notion of common factor risk is the Capital Asset Pricing Model (CAPM). In the CAPM, we define an equilibrium relationship between returns and common factor risk, using only a single common factor risk, the returns of the market itself. The CAPM expresses the returns of any individual asset like so:
$$E[r_i] = r_f + beta^M_i (r_M - r_f)$$
Where:
- (r_f) is the risk-free rate
- (r_M) is the return of the market
- (beta^M_i = {COV[r_i,r_m] over VAR[r_M]} ) is the influence of the market on the excess return of the i-th asset over the market
The CAPM decomposes the returns of individual assets into the portion of the returns explained by the market at large and the portion of returns expected from a risk-free asset. This is a simplistic view of the market that does not hold up in empirical tests. Many improvements upon the CAPM have been developed since its inception, such as the Fama-French three-factor model (Fama and French 1993), which extends from a single source of risk to include two additional sources of risk, company size and company value. The Fama-French three factor model can be expressed as:
$$r_i = r_f + beta^M_i(r_M - r_f) + beta^{SMB}_ir_{SMB} + beta^{HML}_ir_{HML} + alpha_i$$
Where:
- (r_{SMB}) is the return from the risk premium of small market cap stocks over large market cap stocks (SMB)
- (r_{HML}) is the return from the risk premium of high book-to-market ratio stocks over low book-to-market ratio stocks (HML)
- (beta^{SMB}_i) is the risk exposure of (r_i) to SMB
- (beta^{HML}_i) is the risk exposure of (r_i) to HML
- (alpha_i) is the unexplained return of the asset (i)
As a final example, Arbitrage Pricing Theory (APT) (Ross 1976) is a generalization of the CAPM and similar models, which allows us to measure the influence of more than one factor when considering the forces that drive returns. APT expresses the returns of individual assets using a multiple linear regression, a linear factor model, like so:
$$r_i = alpha_i + beta_{i,0}F_0 + beta_{i,1}F_1 + .. + beta_{i,m}F_m+ epsilon_i$$
Where:
- (F_j,j text{ } epsilon text { } {0,m}) is the set of return streams of the common factors in our model
- (beta_{i,j},j text{ } epsilon text { } {0,m}) is the set of risk exposures of (r_i) to each common factor risk
- (alpha_i) is the unexplained return of asset (i)
- (epsilon_i) is the idiosyncratic shock of asset (i)
The factors in APT are return streams that are entirely dominated by single characteristics. In the Fama-French model, our ways to explain returns are limited to the market, SMB, and HML, while with APT we can add as many factors as we want in order to account for the various common factors that are relevant to us. APT forms the basis of the Quantopian Risk Model.
The QRM is a multi-factor risk model which seeks to decompose each asset’s returns across a suite of 16 individual fundamental factors. The 16 factors in the model are comprised of 11 sector factors and 5 style factors. The QRM does not explicitly model a standalone market factor. The factors included as common risk factors were chosen for their degree of independence from each other while seeking to explain the returns of the largest number of assets in the market possible.
The QRM design is by definition designed to model historical and current risk as opposed to serving as a risk forecasting tool.
This section begins the technical implementation of the QRM.
Notation Guide
Summary of basic notational conventions:
- Lowercase letter indicates vector, e.g. (a)
- Uppercase letter indicates matrix, e.g. (A)
- Uppercase letter with subscript (text{:,}j) indicates the (j^{th}) column of matrix (A), e.g. (A_{:,j})
- Uppercase letter with subscript (itext{,:}) indicates the (i^{th}) row of matrix (A), e.g. (A_{i,:})
Mathematically, the QRM has the following form,
$$r_{i,t} = sum_{j=1}^nbeta_{i,j,t}^{sect}f_{j,t}^{sect} + sum_{k=1}^mbeta_{i,j,t}^{style}f_{j,t}^{style} + epsilon_{i,t}, tag1$$
Where:
- (r_{i,t}) is the return of asset (i) on date (t)
- (n) is the number of sector factors
- (m) is the number of style factors
- (beta_{i,j,t}^{sect}) is the (j^{th}) sector factor exposure of asset (i) on day (t). Factor exposure is also called a factor loading. It measures the relationship between the dependent variable and the underlying factor. For asset (i), the (beta_{i,j,t}^{sect} ) is zero if the asset does not belong to the (j^{th}) sector.
- (f_{j,t}^{sect}) is the return of the (j^{th}) sector factor on day (t)
- (beta_{i,k,t}^{style}) is the (k^{th}) style factor exposure of asset (i) on day (t)
- (f_{k,t}^{style}) is the return of the (k^{th}) style factor on day (t)
- (epsilon_{i,t}) is the residual term for asset (i) on day (t) in model (1).
The mathematical model (1) is derived from sub-model (1a)
$$r_{i,t} = sum_{j=1}^nbeta_{i,j,t}^{sect}f_{j,t}^{sect} + epsilon_{i,t}^{sect},tag{1a}$$
and sub-model (1b)
$$epsilon_{i,t}^{sect} = sum_{k=1}^mbeta_{i,k,t}^{style}f_{k,t}^{style} + epsilon_{i,t},tag{1b}$$
Where:
- (epsilon_{i,t}^{sect}) is the residual term for asset (i) on day (t) in sub-model (1a).
Sector factors are used to represent the influence of different sectors. The QRM defines sectors using sector classifications as defined by Morningstar (Morningstar, Inc. n.d.). Furthermore, the QRM uses sector ETF returns to represent the corresponding sector factor returns. The following table maps each sector to its index in the mathematical model (1), corresponding ETF, Morningstar sector code, Quantopian security identifier (SID), and variable name used in the Quantopian API, respectively.
Sector | Sector index (j) | ETF | Morningstar code | SID | Variable name in the Quantopian API |
Materials | 1 | XLB | 101 - Basic Materials | 19654 | materials |
Consumer Discretionary SPDR | 2 | XLY | 102 - Consumer Cyclical | 19662 | consumer_discretionary |
Financials | 3 | XLF | 103 - Financial Services | 19656 | financials |
Real Estate | 4 | IYR | 104 - Real Estate | 21652 | real_estate |
Consumer Staples | 5 | XLP | 205 - Consumer Defensive | 19659 | consumer_staples |
Healthcare | 6 | XLV | 206 - Healthcare | 19661 | health_care |
Utilities | 7 | XLU | 207 - Utilities | 19660 | utilities |
Telecom | 8 | IYZ | 308 - Communication Services | 21525 | telecom |
Energy | 9 | XLE | 309 - Energy | 19655 | energy |
Industrials | 10 | XLI | 310 - Industrials | 19657 | industrials |
Technology | 11 | XLK | 311 - Technology | 19658 | technology |
Each sector factor's returns are known and every asset in Quantopian's database is mapped to at most one single sector. Therefore, only the sector factor exposures need to be estimated.
Style Factors
The QRM includes 5 style factors: momentum, size, value, short-term reversal, and volatility. Each style factor is designed to replicate a traditional investment strategy. The following table maps each style factor to its index in the mathematical model (1) and variable name in the Quantopian API:
Style factor name | Style index (j) | Variable name in the Quantopian API |
momentum | 1 | momentum |
size | 2 | size |
value | 3 | value |
short-term reversal | 4 | reversal_short_term |
volatility | 5 | volatility |
Momentum: The momentum factor captures the difference in returns between stocks on an upswing (winner stocks) and stocks on a downswing (loser stocks) over a trailing 11-month period.
Size: The size factor captures the difference in returns between large-cap stocks and small-cap stocks.
Value: The value factor captures the difference in returns between inexpensive stocks and expensive stocks.
Volatility: The volatility factor captures the difference in returns between high volatility stocks and low volatility stocks.
Short-term reversal: The short-term reversal factor captures the difference in returns between stocks with strong recent losses theoretically primed to reverse (recent loser stocks) and stocks with strong recent gains theoretically primed to reverse (recent winner stocks) in a short time period.
Style Factor Metric Formulas
The style factor metrics are used to describe the style factors. Below, we provide the mathematical definition for each style factor metric in the QRM.
Momentum
The momentum metric of an asset (i), MOMENTUM, on day (t) is computed by calculating the 11-month cumulative return from 12 months ago to 1 month ago. To avoid look-ahead bias, all the style factors metrics are lagged by one day. The formula is:
The momentum metric of an asset (i), MOMENTUM, on day (t) is computed by calculating the 11-month cumulative return from 12 months ago to 1 month ago. To avoid look-ahead bias, all the style factors metrics are lagged by one day. The formula is:
$$MOMENTUM=prod_{i=-c*12+t-1}^{-c+t-1}(1 + r_{i,l}), $$
Where:
- (r_{i,l,}) is the return of asset (i) on day (l)
- (c) is the number of trading days in one month, here set to a constant of 21.
Size
The size metric of asset (i), SIZE, on day (t) is computed by calculating the (text{ log }) of its company's market capitalization. The formula is:
The size metric of asset (i), SIZE, on day (t) is computed by calculating the (text{ log }) of its company's market capitalization. The formula is:
Where:
- (M_{i,t-1}) is the market capitalization of asset (i) on day (t-1). The companies' financial data used on Quantopian is Morningstar fundamental data accessed through the Pipeline API.
Value
The value metric of asset (i), VALUE, on day (t) is computed by calculating the ratio of the company's stockholders' equity and market capitalization. The formula is:
The value metric of asset (i), VALUE, on day (t) is computed by calculating the ratio of the company's stockholders' equity and market capitalization. The formula is:
$$VALUE = { S_{i,t-1} over M_{i,t-1}} $$
Where:
- (S_{i,t-1}) is the company's stockholders' equity of asset (i)
Short-term reversal
The short-term reversal metric of asset (i), STR, on day (t) is computed by calculating the negative relative strength index (RSI). The formula is:
The short-term reversal metric of asset (i), STR, on day (t) is computed by calculating the negative relative strength index (RSI). The formula is:
Where:
- (RSI_{t-1}) is the relative strength index on a 14-day time frame from day (t-1) to (t-15)
Volatility
The volatility of asset (i), VOL, on day (t) is computed by calculating the trailing 6-month return volatility. The formula is:
The volatility of asset (i), VOL, on day (t) is computed by calculating the trailing 6-month return volatility. The formula is:
$$VOL = sqrt{{1 over 6c}sum_{l=t-1}^{-6c -1 + t}(r_{i,l} - bar{r}_i)}$$
Where:
- (c) is the number of trading days in one month, here set to 21.
- (bar{r}_i) is the mean return of asset (i) in the time period ((-6c - 1 + t, t - 1))
As introduced, the QRM consists of two sub-models. Submodel (1a) estimates the sector factor exposures of all stocks using linear regression and passes the residual returns (epsilon_{i,t}^{sect}) to sub-model (1b). Then, sub-model (1b) uses (epsilon_{i,t}^{sect}) as input to estimate the style factor returns associated with style factor exposures.
Sector Factor Calculation
The QRM estimates the sector factor exposure of each asset using a trailing 2-year window of stock returns and its respective sector factor returns. The procedure is as follows:
For each stock (i) on day (t):
- Find the Morningstar sector code of stock (i)
- Choose the sector ETF that matches the Morningstar sector code of stock (i)
- Compute the 2-year trailing historical returns of stock (i) on day (t), and format them in a vector column (r_i)
- Compute the 2-year trailing historical returns of selected ETF from step 2 on day (t), and format them in a vector column (f)
- Regress the vector columm (r_i) on the vector column (f)
- Obtain the regression coefficient, (beta), and set it as the respective sector factor exposure
- Set other sector factor exposures as zeros
- Compute the 2-year trailing historical sector residual returns, (epsilon_i^{sect}), by subtracting (beta f) from (r_i)
For example, let (t) be 2013-JAN-02 and stock (i) be AAPL. Then:
- the selected ETF would be XLK
- the vector column (f) would be the daily returns of XLK from 2010-DEC-31 to 2013-JAN-02
- the vector column (r_i) would be the daily returns of AAPL from 2010-DEC-31 to 2013-JAN-02
- the (beta) would be the technology sector factor exposure of AAPL
- the vector column (epsilon_i^{sect}) that equals (r_i - beta f) would be the trailing historical sector returns from 2010-DEC-31 to 2013-JAN-02
If we plug this example into the sub-model (1a), it can be written as
$$r_{i,t} = sum_{j=1}^nbeta_{i,j,t}^{sect}f_{j,t}^{sect} + beta f_t + epsilon_{i,t}^{sect},$$
- (f_t) is the last entry of (f)
- (epsilon_{i,t}^{sect}) is the last entry of (epsilon_i^{sect})
- the term (sum_{j=1}^nbeta_{i,j,t}^{sect}f_{j,t}^{sect}) equals to 0
To estimate the returns of the style factor, it is not proper to use all stocks in the market. We need to define a universe, the estimation universe, which can represent the market while excluding 'problematic' assets such as REITs, ADRs, illiquid stocks, etc. Choosing the stocks in an estimation universe is subjective. The estimation universe in the QRM has about 2100 stocks. The selection criteria include:
- being a common stock
- having enough data to compute style factor metrics
- being in the top 3000 most liquid stocks
The stocks outside the estimation universe are called complementary stocks. The universe that includes both the stocks in the estimation universe and the complementary stocks is called the coverage universe. We will demonstrate how to compute the style factor exposures of stocks in the estimation universe, how to estimate style factor returns, and how to compute the style factor exposures of complementary stocks.
Style factor exposures of stocks in the estimation universe
The style factor exposures of the stocks in the estimation universe on day (t) are calculated by z-scoring the style factor metrics of the stocks on day (t). They are standardized (z-scored) with respect to the estimation universe.
The style factor returns are estimated day-by-day for two years using a cross-sectional regression.
For each day (t) in the trailing two years:
- Calculate the 5 style factor exposures of the stocks in the estimation universe, and store them in the columns of a matrix (B)
- Collect day (t)'s sector residuals of stocks in the estimation universe and form them in a column vector (epsilon_t^{sect})
- Regress the column vector (epsilon_t^{sect}) on the matrix (B)
- Obtain 5 style factor returns from the coefficients of the regression (f_{1,t}^{style}, f_{2,t}^{style}, .., f_{5,t}^{style} )
- Generate 5 vector columns, (f_k^{style} (k = 1, 2, .. 5) ) and store (f_{k,t}^{style} ) in (f_k^{style} )
- Collect the residual returns of the stocks in the estimation universe on day (t) by subtracting (sum_{k=1}^5B_{:k} f_{k,t}^{style}) from (epsilon_t^{sect} )
Figure 1 shows the relationship between (epsilon_t^{sect} ), (epsilon_i^{sect} ), and (epsilon_{i,t}^{sect} ) in matrix form.
Figure 2 shows the relationship between (f_k^{style} ) and (f_{kt}^{style} ).
Style factor exposures of complementary stocks
Style factor exposures for complementary stocks are calculated by solving a time-series multi- linear regression of 5 style factor returns with the sector residuals. Here, we use a 2-year window of return series of the style factor returns and sector residuals. The procedure is as follows.
For each complementary stock (i) on day (t):
- Collect the style factor returns (f_k^{style}, k=1,2,..,5 )
- Collect 2-year trailing historical sector residual returns, (epsilon_i^{sect} )
- Run multi-linear regression with dependent variable (epsilon_i^{sect} ) and independent variables (f_k^{style}, k=1,2,..,5 )
- Obtain the regression coefficients, (beta^{k,t}^{style}k=1,2,..,5 ) and set them as corresponding style factor exposures
- Compute 2-year trailing historical residual returns, (epsilon_i ) by subtracting (sum_{k=1}^5 beta_{i,k,t}^{style} f_{k}^{style}) from (epsilon_i^{sect} )
The risk of an asset (i) over (T) time periods is defined as:
$$sigma = {sqrt{{1 over T} {sum_{l=1}^r} (r_l - bar{r}_i)^2 }}tag2$$
Where:
- (r_{i,l}) is the return of asset (i) on time (l)
- (bar{r}_i) is the average return of asset (i) over (T) time periods
The risk of each factor return can be calculated directly by equation (2). For example, the risk of the (k^{th}) style factor over (T) time periods is
$${sqrt{{1 over T} {sum_{l=1}^T} (f_{k,l}^{style} - bar{f}_k^{style})^2 }} $$
Similarly, the risk of each exposure weighed factor returns also can be calculated by equation (2). For example, the risk of (k^{th}) exposure-weighted style factor over (T) time periods is:
$${sqrt{{1 over T} {sum_{l=1}^T} (beta_{i,k,t}^{style} f_{k,l}^{style} - overline{beta_k^{style} f_k^{style}} )^2 }}. $$
The Quantopian Risk Model is a 16-factor risk model built to aid our users and investment in the research and evaluation of high-quality trading algorithms. We use classical techniques in finance to compute risk exposures to each relevant factor for US equities. The risk model factors loadings and factor returns are fully available, for free, within the Quantopian Research environment and backtester on the Quantopian website. Further research is to come on common factors that could be useful in international markets.
References
Axioma, Inc. 2011. Axioma Robust Risk Model Handbook. Axioma, Inc.
BARRA, Inc. 1998. United States Equity. BARRA, Inc.
Fama, Eugene F, and Kenneth R French. 1993. 'Common risk factors in the returns on stocks and bonds.' Journal of Financial Economics 3-56.
Morningstar, Inc. n.d. Morningstar® Data for Equities.
Ross, Stephen A. 1976. 'The Arbitrage Theory of Capital Asset Pricing.' Journal of Economic Theory 341-360.
Sharpe, William F. 1964. 'Capital Asset Prices: A Theory of Market Equilibrium under Conditions of Risk.' The Journal of Finance 425-442.
Portfolio turnover assumptions
The periodicity of the data used for QRM is daily, which results in the underlying assumption that the minimum holding period for each asset is at least 1 day. An investment strategy with significant intraday trading or a very high turnover rate, would not be appropriate to analyze with the current QRM.
The QRM covers about 4000 stocks in US stock market, but it does not contain all of the assets. If a portfolio has a sizeable weight invested in assets outside of the coverage universe, it is not proper to analyze it with QRM.
The current QRM does not cover ETFs except the sector ETFs and a few pre-selected ETFs (that are used for testing).
Axioma Risk Model Handbook Pdf
Summary of calculations
Factor type | Stock type | Factor exposures | Factor returns |
Sector | Stocks in coverage universe | Time-series linear regression | Given sector ETFs |
Style | Stocks in the estimation universe | Normalized risk metrics | Cross-sectional regression |
Complementary stocks | Time-series linear regression | Time-series linear regression |
The QRM whitepaper can be downloaded here.
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