When to Adjust Alpha During Multiple Testing

https://www.qeios.com/read/QIH0Q1

When to Adjust Alpha During Multiple Testing - Article (v1) by Mark Rubin | Qeios

Counting number of duplicated cases by several variables

proc sort data=have(keep=key1 key2);
  by key1 key2;
run;
data want;
  do count=1 by 1 until(last.key2);
    set have;
    by key1 key2;
    end;
run;

A very clear introduction to B-SPLINES