Assigning GRADES

data assign;
set draft;
*temperature in celsius;
temp=temperature;

*INCREASE IN TEMPERATURE;
if (temp^= . & temp>= 38) then do;
if 38 <= temp<= 39 then grade= 'GRADE1'; else if 39 < grade=" 'GRADE2';"> 40 then grade= 'GRADE3';
end;
*DECREASE IN TEMPERATURE;
else if (temp^= . & temp<= 35) then do;
if 35 >= temp> 32 then grade= 'GRADE2';
else if 32 >= temp> 28 then grade= 'GRADE3';
else if temp<= 28 then grade= 'GRADE4'; end;

run;