updated CHR model files from Ch20-25

CH23 electric 1c is slower with CHR
CH22 anova is slightly slower with CHR (~ 12 vs 15 sec)
CH 21 radon vary intercept floor2 is slower by like 1 sec
	radon vary intercept floor is slower by like 1-2 sec
CH 20 HIV slower by ~ 2 sec
removed samples.csv