Author Archives: Kai Chen

Stata commands to test equality of mean and median

Please read this post for how to display the results in a ready-for-use format. UCLA IDRE has posted an article (link) that may provide a bit more explanation. UCLA IDRE is a great resource for learning statistical analysis. A big thank you … Continue reading

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Stata command to display combined Pearson and Spearman correlation matrix

Oftentimes we would like to display Pearson correlations below the diagonal and Spearman correlations above the diagonal. Two built-in commands, pwcorr and spearman, can do the job. However, we have to manually combine Stata output tables when producing the correlation table … Continue reading

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Stata command to convert string GVKEY to numerical GVKEY or vice versa

The default type of GVEKY in Compustat is string. Sometimes, we need it to be a numerical type in Stata (e.g., when we want to use the super handy command tsset). The command to convert string GVKEY to numerical GVEKY … Continue reading

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Stata command to calculate the area under ROC curve

If we want to evaluate the predictive ability of a logit or probit model, Kim and Skinner (2012, JAE, Measuring securities litigation risk) suggest that A better way of comparing the predictive ability of different models is to use the Receiver … Continue reading

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Stata commands to calculate skewness

Suppose we are going to calculate the skewness of 12 monthly returns. The 12 returns may be stored in a row (Figure 1) or in a column (Figure 2). This post discusses how to calculate the skewness in these two … Continue reading

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Use Python to download lawsuit data from Stanford Law School’s Securities Class Action Clearinghouse

[Update on 2019-07-07] I am grateful to Shiyu Chen, my research assistant, who did a very good job on not only web scraping the top-level table, but also extracting from the case summary page additional information (link to case summary … Continue reading

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Calculate idiosyncratic stock return volatility

I have noted two slightly different definitions of idiosyncratic stock return volatility in: Campbell, J. Y. and Taksler, G. B. (2003), Equity Volatility and Corporate Bond Yields. The Journal of Finance, 58: 2321–2350. doi:10.1046/j.1540-6261.2003.00607.x Rajgopal, S. and Venkatachalam, M. (2011), … Continue reading

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Commonly used Stata commands to deal with potential outliers

In accounting archival research, we often take it for granted that we must do something to deal with potential outliers before we run a regression. The commonly used methods are: truncate, winsorize, studentized residuals, and Cook’s distance. I discuss in … Continue reading

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Use Python to extract URLs to HTML-format SEC filings on EDGAR

[Update on 2019-08-07] From time to time, some readers informed that the first-part code seemingly stopped at certain quarters. I don’t know the exact reason (perhaps a server-side issue). I never encountered the issue. I would suggest that you just … Continue reading

Posted in Python | 26 Comments

Sample code for “outreg” command in Stata

outreg is a time-saving and must-have command in Stata. It will generate a ready-for-use results table like this. I’m sure you will see what a relief this can give us. outreg is not a built-in command and can be installed … Continue reading

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