Stata continues to do this until all variables have been used. Using Loops to Define Missing Data Codes. Time for one more example. It is not uncommon to open up a data set and find the code for missing data to be “99” or “999” or some other number. Stata recognizes the period, “.” as missing data. Transpose¶. The transpose of any expression can be obtained using the syntax expr.T . Transpose is an affine function.
Transposing matrices is notorious for the problems it causes with memory caches. If your array is large enough that the performance of a transpose is significant, and you cannot avoid transposing by simply providing an interface with swapped indices, then your best option is to use an existing library routine for transposing large matrices.
grouplabs is a powerful command to create value labels for the groupped variables in Stata. It is extremely useful in the presence of multiple variables, and especially if they are of different types (numeric or strings).