wt.mean {SDMTools} | R Documentation |
wt.mean
calculates the mean given a weighting of the
values.
wt.var
is the unbiased variance of
the weighted mean calculation using equations of GNU
Scentific Library
(http://www.gnu.org/software/gsl/manual/html_node/Weighted-Samples.htmland.
wt.sd
is the standard deviation of the weighted mean
calculated as the sqrt of wt.var
.
Note: NA data is automatically ommitted from
analysis.
wt.mean(x, wt) wt.var(x, wt) wt.sd(x, wt)
x |
is a vector of numerical data. |
wt |
is a vector of equal length to |
returns a single value from analysis requested.
Jeremy VanDerWal jjvanderwal@gmail.com
#define simple data x = 1:25 # set of numbers wt = runif(25) #some arbitrary weights #display means & variances (unweighted and then weighted) mean(x); wt.mean(x,wt) var(x); wt.var(x,wt) sd(x); wt.sd(x,wt)