As data in the attachment. I have 250 items , "key" is the key of each item, COL1 to COL52 are the responses of 52 candidates to those 250 items. I want to choose any pair from those 52 candidates, that is, C(52, 2)=52!/(52-2)!2!, and compare the responses of EACH PAIR with the "key" . For example, data comb1; set comb; if COL1=COL2=key then category="same resp and both correct"; else if COL1=COL2 and COL1^=key then category="same resp and both wrong"; else if COL1=COL2 and COL2^=key then category="same resp and both wrong"; else if COL1=key then category="different resp and one of them correct"; else if COL2=key then category="different resp and one of them correct"; else category="different resp and both wrong"; run; Because C(52, 2)=52! / (52-2)!2! = 1326 pairs, for each pair, I want to use the code above, how should I do it in SAS? thank you!
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