where GR is the annual diameter or height growth, dbh the diameter
at breast height, CR the crown ratio, PBAL the basal area in trees
larger than the subject tree for a plot, SL the average slope of the
plot (%), PRECIP the annual and/or seasonal precipitation (10
mm), TEMP the mean annual or seasonal maximum or minimum
temperature (10 C) or number of degree days, ASP the average aspect
of the plot (radians), ELEV the average elevation of the plot,Albrx the longitude in UTM coordinates, Albry the latitude in UTM
coordinates, eik the error of kth measurement on the ith tree, and
e is the unexplained error.