Remove the Cook's Distance

[kngu022]

ODS GRAPHICS ON;
PROC REG DATA=Gas PLOTS(UNPACK);
MODEL lnox = E E2 / CLB; OUTPUT OUT=resid R=resid P=pred;
WHERE Nox > 0.9; RUN; QUIT;
PROC LOESS DATA=resid; MODEL resid = pred / SMOOTH=0.8; RUN; ODS GRAPHICS OFF;

Hi everyone,

above it is the code for quadratic model. For Cook's Distance it still has some outlier which is above 0.2, 0,3 and 0.4. Could you tell me how can I remove these outlier please?

Thanks a lot.

[unison · Accepted solution]

What about something along these lines:

*Output new_class where cookd<0.2;
proc reg data = sashelp.class;
  model height = age;
  output out = new_class(where=(cookd<0.2)) cookd = cookd;
run;
quit;

*check results of reg on new_class;
proc reg data = new_class;
  model height = age;
run;
quit;