I am receiving the error that says the class variable has more than two levels, but i am pretty sure i only have two. Please help.     PROC IMPORT DATAFILE=REFFILE DBMS=CSV OUT=WORK.IMPORT; GETNAMES=YES; RUN; PROC CONTENTS DATA=WORK.IMPORT; RUN; %web_open_table(WORK.IMPORT); DATA IMPORT; infile '/folders/myfolders/sasuser.v94/nyc-rolling-sales.csv'; INPUT NEIGHBORHOOD $ Sales_Price; proc ttest; class neighborhood; /* defines the grouping variable */ var sales_price; /* variable whose means will be compared */ run; ... View more