reset data
reset i/o
reset plot control
dimension 500 30
read mpc441.dat run wafer probe mo day op temp y s df
dimension 500 30
read mpc441.dat run wafer probe mo day op temp y s df
let y1 = average y subset run 1
let y2 = average y subset run 2
let ybar = (y1 + y2)/2
let ss = (y1-ybar)**2 + (y2-ybar)**2
let v3 = 1
let s3 = (ss/v3)**.5
print s3 v3