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281. Creating dummy variables
     How do I create dummy variables?

282. Stata 5: Goodness-of-fit chi-squared test reported by poisson
     Stata 5: Why does the goodness-of-fit chi-squared test reported by poisson change when the counts
     and exposures are grouped differently?

283. Regular expressions
     What are regular expressions and how can I use them in Stata?

284. Calculating variables containing weighted group summary statistics
     I want to calculate a variable containing weighted group summary statistics, but I do not want to
     collapse the data and egen does not support weights. How can I do this?

285. Using StataCorp-written .idlg files
     What can you tell me about using the .idlg files that are written by StataCorp and used in their
     dialogs?

286. Failure time, censoring time, and entry time in the Cox model
     Why can’t a subject die at time 0?

287. Do-it-yourself R-squared
     How can I get an R-squared value when a Stata command does not supply one?

288. Stata 6: Estimating a Cox model with a continuously time-varying parameter
     Stata 6: How do I estimate a Cox model with a continuously time-varying parameter?

289. Making graphs come out square
     How do I make my graphs come out square?

290. Stata 7: Moving averages for panel data
     Stata 7: How can I calculate moving averages for panel data?



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