proc import 
datafile="C:\Users\classtoolo\Downloads\wage.xlsx"
dbms=xlsx out=wage;
run;
/* proc print;
run;
proc contents;
run; */
proc means n mean std Q1 
median Q3 maxdec=3;
var wage educ exper tenure;
run;
proc corr data=wage
nosimple pearson spearman;
var wage educ exper tenure;
run;
ods graphics off;
proc reg data=wage;
model wage=educ exper tenure / vif white;
run; quit;
* log-level model;
* an F-test whether the effect of
educ and tenure on lwage is the same;
proc reg data=wage;
model lwage=educ exper tenure / white;
test educ=tenure;
output out=wage_out;
run; quit;