Tagging observations ignored in regression

[Chinmay Sharma]

Hi All,

Suppose I have data like this:

--------------------- copy starting from the next line -----------------------

* Example generated by -dataex-. To install: ssc install dataex
clear
input float(y x)
213  3
 23  4
 32 23
 12 34
321 43
 21  2
  .  .
  1  3
  3  .
end

In the above, if I were to run a regression of y on x, rows 7 and 9 would not be included in the regression as Stata ignores rows when at least one variable has a missing value. The dataset I am working with is quite large. Is there a quick way of tagging which observations have been ignored from the regression? The brute force way would be to tag missing values for all variables, but that can be cumbersome when the design matrix is big.

Best,
Chinmay

[Carole J. Wilson]

 
 generate sample = e(sample)

[Jay Westreich]

egen reg_check=rowmiss(varlist)
gen not_in_reg=1 if reg_check>0
replace not_in_reg=0 if missing(not_in_reg)

[Chinmay Sharma]

Thanks a lot!