*set everything that has different birthdays as high risk; if old_birthday -new_birthday>0 then flag="highrisk"; else flag="lowrisk"; *set those with reversed day months back to low risk; if (month(new_birthday)=day(old_birthday) or day(new_birthday)=month(old_birthday) then flag="lowrisk"; *separate out the last and second last digits in year; yearold=year(old_birthday); yearnew=year(new_birthday); yearlastdigitnew= yearnew-int(yearnew/10)*10; yearlastdigitold=yearold-int(yearold/10)*10; year2ndlastdigitnew=int(yearnew/10)-int(yearnew/100)*10; year2ndlastdigitold=int(yearold/10)-int(yearold/100)*10; *set those with reverse last year digits to low risk; if (yearlastdigitnew=year2ndlastdigitold) or (yearlastdigitold=year2ndlastdigitnew) then flag="lowrisk";
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