topic weight variable in SAS Data Science

weight variable

Geo- — Sat, 03 Nov 2018 03:45:13 GMT

How to understand weight variable here?what is it for?redm_flag=0 means negative samples.

proc surveyselect  data=lg.develop_original(where=( redm_flag =0)) noprint
method=srs rate=0.1  out=lg.develop_sury ;
run;
data lg.develop_final;
set lg.develop_ original(where=( redm_flag =1)) lg.develop_sury;
if redm_flag=1 then weight=1;
else weight=10;
run;
proc freq data= lg.develop_final;
weight weight;
table redm_flag/missing;
run;

Re: weight variable

Rick_SAS — Sun, 04 Nov 2018 20:18:00 GMT

The first proceu\dure extracts 1/10th of the observations where redm_flag=0. Each observation gets a weight of 10 to indicate that it represents 10 observations.

The DATA step merges that sample with all observations where redm_flag=1. Those observations get a weight of 1 to indicate that they represent 1 obs.

The PROC FREQ step estimates the proportions from the weighted sample.