topic Re: baseline, previous value and blank values in SAS Procedures

baseline, previous value and blank values

michtka — Mon, 30 Apr 2012 16:46:35 GMT

Hi everyone,

I have the next dataset:

subjid cpevent text value

100 screening weight 40

100 day1 weight .

100 day1 pulse .

and I want to get:

100 day1 weight 40

100 day1 pulse .

I mean, recording only the previous value when baseline (day1) is missing, (weigth 40), but keeping the missing value of baseline

if not previous value are recording (pulse dont have screening record, then I leave blank ).

Cheers,

Re: baseline, previous value and blank values

Haikuo — Mon, 30 Apr 2012 17:06:02 GMT

If I understand you correctly,

data have;

infile cards truncover;

input (subjid cpevent text) (:$10.) value;

cards;

100 screening weight 40

100 day1 weight .

100 day1 pulse .

;

data want (drop=_w);

set have;

retain _w;

by subjid;

if first.subjid and cpevent='screening' then _w=value;

if value=. and text='weight' then value=_w;

if cpevent ne 'screening' then output;

run;

proc print;run;

Regards,

Haikuo

Re: baseline, previous value and blank values

Ksharp — Wed, 02 May 2012 04:35:32 GMT

Not understand what you mean.

data have;
infile cards truncover;
input (subjid cpevent text) (:$10.) value;
cards;
100 screening weight 40
100 day1 weight .
100 day1 pulse .
;
run;
data want(where=(cpevent='day1'));
 set have;
 lag_value=lag(value);
 if subjid eq lag(subjid) and cpevent='day1' and missing(value) then  value=lag_value;
 drop lag_value;
run;

Ksharp