I am attempting to run a two-sample test with a data set imported from an excel sheet. There are two values of data, Before and After, that I am attempting to compare. When I input the information, I am receiving a log error "ERROR: The CLASS variable has more than two levels." Can someone support with what is missing? 87 /* Test for normality */ 88 proc univariate data=WORK.COFFEE normal mu0=0; 89 ods select TestsForNormality; 90 class After; 91 var Before; 92 run; 93 94 /* t test */ 95 proc ttest data=WORK.COFFEE sides=2 h0=0 plots(showh0); 96 class After; 97 var Before; 98 run;
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