put missing value by id

[sasphd]

hello

I have this program to calculate the variable flux. I want that the program begin the calculation only after 3 missing value for each id (rank_no here)

data flux1;
set JOINT_Ftna2;
by rank_no;
rtri=((mret))*(lag1(mret))*(lag2(mret))-1;
flux=(new_TNA_LATEST-lag3(new_TNA_LATEST)*(1+rtri))/lag3(new_TNA_LATEST);

run;

Have

CALDT	Rank_NO	CRSP_FUNDNO	MRET	new_TNA_LATEST	rtri
1985-02-28	1	53	1,00062422	39,2
1985-03-29	1	53	1,00935745	39,2
1985-04-30	1	53	1,00061805	39,2	0,01061174
1985-05-31	1	53	1,05514655	39,2	0,06567826
1985-06-28	1	53	1,02113917	39,2	0,07811738
1985-07-31	1	53	1,00115009	39,2	0,07869063
1985-08-30	1	53	0,99478865	39,2	0,01698593
1985-09-30	1	53	0,98020955	39,2	-0,02377722
1997-09-30	2	103	1,05448301	113,689	0,1056362
1997-10-31	2	103	0,97858404	113,689	0,02168359
1997-11-28	2	103	1,02221451	113,689	0,0548234
1997-12-31	2	103	1,00469527	49,983	0,00501959
1998-01-30	2	103	0,9622905	49,983	-0,01171411
1998-02-27	2	103	1,09756894	49,983	0,06113921
1998-03-31	2	103	1,03639974	49,983	0,09462485
1998-04-30	2	103	1,01915709	49,983	0,15931173

want

CALDT	Rank_NO	CRSP_FUNDNO	MRET	new_TNA_LATEST	rtri	flux
1985-02-28	1	53	1,00062422	39,2
1985-03-29	1	53	1,00935745	39,2
1985-04-30	1	53	1,00061805	39,2	0,01061174
1985-05-31	1	53	1,05514655	39,2	0,06567826	-0,06567826
1985-06-28	1	53	1,02113917	39,2	0,07811738	-0,07811738
1985-07-31	1	53	1,00115009	39,2	0,07869063	-0,07869063
1985-08-30	1	53	0,99478865	39,2	0,01698593	-0,01698593
1985-09-30	1	53	0,98020955	39,2	-0,02377722	0,02377722
1997-09-30	2	103	1,05448301	113,689	0,1056362
1997-10-31	2	103	0,97858404	113,689	0,02168359
1997-11-28	2	103	1,02221451	113,689	0,0548234
1997-12-31	2	103	1,00469527	49,983	0,00501959	-0,56537283
1998-01-30	2	103	0,9622905	49,983	-0,01171411	0,01171411
1998-02-27	2	103	1,09756894	49,983	0,06113921	-0,06113921
1998-03-31	2	103	1,03639974	49,983	0,09462485	-0,09462485
1998-04-30	2	103	1,01915709	49,983	0,15931173	-0,15931173

[ballardw]

You missed a step. What exactly do you mean by missing value in: " I want that the program begin the calculation only after 3 missing value for each id (rank_no here)"?

Your Have data does not show any "missing values" for 3 of anything. The most you show is two missing values of RTRI for Rank_no=1.