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Articles tagged with: Crude Oil

06 March 2020

Market Risk Effects from Coronovirus II

The recent spread of covid19 has also seen rapid changes in asset/sector correlations:

This is a matrix representing the return correlation across multiple assets (Gold, WTI Oil, US 10-Year Rates, US Equity Markets and multiple market sectors; healthcare, utilities, banks, and energy) through Feb 20.

Here is the same matrix through March 5th. Note the higher correlations across all assets other than Gold.

To emphasize the point, the above shows a rolling average matrix cross correlation, showing the average pairwise correlation increasing since the covid19 epidemic hit Western Europe.

All calculations are as of 3/5/2020, executed on daily data since 12/31/2019.

The results above were calculated using The RiskAPI Add-In, our unique software client which allows fund managers to access a whole spectrum of on-demand portfolio risk analysis calculations.

24 February 2016

Increasing US Equity Market Exposure to Oil

For many equity markets so far this year, one of the single biggest drivers of performance has been the sharp declines in the price of crude oil as well as the sharp increase in oil volatility. With oil moves in excess of 5% now a regular occurrence, you'd be forgiven for suspecting that nearly every passing dramatic high or low open, for the US Equity market at least, has been dictated by whether or not oil has crashed below or recovered above the now all-important $30 level.

The chart below demonstrates that any such suspicion is entirely well-founded.

The chart shows a clear up-trend in US equity market correlation to WTI crude. A very clear conclusion to draw from this from both a portfolio and a risk management perspective is the that the importance of oil prices as an equity risk factor, at least for now, cannot be understated.

All calculations are as of 2/23/2016, executed on 1-year of daily data.

The results above were calculated using The RiskAPI Add-In, our unique software client which allows fund managers to access a whole spectrum of on-demand portfolio risk analysis calculations.

19 June 2013

Introducing Filtered Beta

Examining Downside Market Exposure: Filtered (Downside) Beta

Beta (aka simple linear regression) has long been a widely used measure of single name and portfolio exposure to a benchmark. One of the drawbacks of beta, however, is that it lumps in all returns, regardless of direction, into the same analytical basket. Those wishing to measure index exposure isolating negative portfolio return observations are mostly out of luck. The best they can do is pick a historical time period where the asset or portfolio of interest lost money most of the time.

What is needed, therefore, is a version of beta that only includes observations where an asset exclusively experiences negative returns. The objective is to understand what the asset's exposure to a benchmark is purely on days where it loses value. In portfolio manager-speak, this translates into: "On days when we lost money, what was our exposure to the market?". This is an interesting data point for many alpha-seeking stock pickers: their objective is to find single name stocks that enjoy gains when the market is bid and yet do not wholly participate in market crashes.

The Mechanics of Filtered Beta:

Although we have been talking about a "downside" measurement, in truth, the generalized case involved here is the filtering of return observations according to arbitrary criteria. For example, we may choose to look at every return in a stock above 0.5%. Therefore, downside beta is merely a special case where the returns are selected according to the following rule:

Xi < 0

Were each Xi is a return observation in the target asset's return history. For example, if an index and a portfolio have the following returns:


For downside beta, only the returns highlighted in bold will be used in the resulting beta calculation. These are the set of returns that correspond to days when the portfolio lost money. Let's take a look at a real-world example using downside beta:

Citigroup (NYSE:C) Vs. S&P500 Index

Taking daily data for both Citi and the S&P since Jan 1, 2013 results in a standard beta of 1.60. Assuming this beta is sound, this tells us that on a given day, we can expect Citi's returns to be about 60% more volatile than the index's returns. If the index has 1% loss, Citi's stock value should decrease by 1.6%. Since we are looking at ALL returns (both positive and negative), we expect this statement to hold true for up days in the market: i.e. if the market rallies 1%, Citi should rally even more: 1.6%.

Now let's look at downside beta for the same period. Applying the filtering mechanism above, we find that the downside beta is down to 1.15. This is good news for a portfolio manager who is long Citigroup. What we've learned here is that on days where the stock loses value, its returns were very nearly in line with those of the market. In other words, when we lost money in our Citi position, in percentage terms, our losses did not exceed the market's losses.

The filtered beta feature is currently only available in RiskAPI Enterprise and will soon be released in the RiskAPI Add-In

The results above were calculated using The RiskAPI Enterprise service, the flexible, high-performance software client connecting funds and fund service providers to PortfolioScience's proprietary risk engine calculations.

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