st: sqset options: keeplongest vs. trim from Brzinsky-Fay,Kohler, and Luniak, 2006

[Irune López Pérez <irunelopez@hotmail.com>]

Hello statalist members,



We are working with a longitudinal (panel)
dataset with missing values only at the beginning and at the end (not in the
middle of the sequence). We want to turn the our data into a sequence
data set using the sqset command. We are having problems using keeplongest and
trim. We really do not understand the difference between them. What does option
“keeplongest” do in comparison to option “trim” when we apply “sqset” to
declare the dataset to be sequence data? Does it maintain the position of the
first observation in the sequence when this is missing? Would it be possible to
see an example how these options are applied and see the results of each of
them?



Thank you very much.

Irune

 		 	   		  
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