Only keep last two digits

[mariko5797]

I want the 100th place of the visit number to correspond with the PERIOD number, where period is based on the subject's individual timeline rather than the study timeline (e.g. Subject B joins the study during second round of drug administration (VISHAVE 300s). Since this drug and follow-up period would be Subject B's first, it counts as Period 1 (VISWANT 200s)).

• Period 1 = Visit 200s
• Period 2 = Visit 300s
• Period 3 = Visit 400s
• Period 4 = Visit 500s

I essentially want to make sure each visit number starts with the associated period number + 1. I figured the easiest way would be to save the last two digits as a temporary variable and then add (period+1)*100. 

e.g. VISHAVE = 312 and PERIOD = 1, then TMP = 12

VISWANT = (PERIOD+1)*100 + TMP = (2)*100 + 12 = 212

Is there a way to only keep a value up to the tenth place?

data visits;
 input id period vishave viswant @@;
 cards;
	1	1	200	200	1	1	201	201
	1	2	300	300	1	2	301	300
	1	3	400	400
	2	1	200	200	2	1	201	201
	2	2	400	300	2	2	402	302
	2	3	500	400	2	3	501	401
	3	1	300	200	3	1	301	201	3	1	306	206
	4	2	500	300	4	2	503	303
;
run;

[PaigeMiller · Accepted solution]

Is there a way to only keep a value up to the tenth place?

I assume you mean that if the value is 304, then you want 4. If the value is 312 then you want 12. Am I correct? (If not, explain more clearly and give examples of "Is there a way to only keep a value up to the tenth place?")

Use the MOD function

wanted_variable = mod(period,100);