* Required fxns: 'srs mean', 'srs ratio mean','regr mean', and 'diff mean';

trees=read.csv('http://webpages.uidaho.edu/~renaes/Data/tree%20volume.csv',header=T)
plot(basal.area,volume,data=trees)



srs.mean('trees',volume,12,250)

srs.muhaty('trees',basal.area,volume,12,250,75/250)

reg.mean('trees',basal.area,volume,12,250,75/250)

diff.mean('trees',basal.area,volume,250,75/250)