Hello programmers,
How can i use the lag function to print out patients that have 15% or more reduction in systolic BP and 8% or more reduction in diastolic BP between visits 1 and 5.
Thanks!
DATA five;
SET four;
lag_systolic = lag(systolic);
dif_systolic = systolic - lag_systolic;
per_incr_sys = (dif_systolic/lag_systolic)*100;
RUN;
proc print; run;
data six;
set five;
lag_diastolic = lag(diastolic);
dif_diastolic= diastolic- lag_diastolic;
per_incr_dia = (dif_diastolic/lag_diastolic)*100;
run;
proc print; run;
data seven;
set six;
if per_incr_sys =< -15 and per_incr_dia =<-8 then output;
run;
proc print; run;
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