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summarize shows that the new variable has a mean of approximately zero; 10??9 is the precision of a float and is close enough to zero for all practical purposes. If we wanted, we could have typed egen double stdage = std(age), making stdage a double-precision variable, and the mean would have been 10??16. In any case, summarize also shows that the standard deviation is 1. correlate shows that the new variable and the original variable are perfectly correlated.
generate’s sum() function creates the vertical, running sum of its argument, whereas egen’s total() function creates a constant equal to the overall sum. egen’s rowtotal() function, however, creates the horizontal sum of its arguments. They all treat missing as zero. However, if the missing option is specified with total() or rowtotal(), then newvar will contain missing values if all values of exp or varlist are missing.
You can model panel data with xt.
How can the updated table command and new etable command do all that? They are built on top of a whole new system for collecting stored results from commands and displaying those results as tables. Stata 17 gives you access to that system too.
Mata functions and operators use heavily optimized LAPACK routines underpinned by the Intel Math Kernel Library.
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