Linear Variance Estimate
Estimates the variance of a statistic from its empirical influence values.
var.linear(L, strata = NULL)
L |
Vector of the empirical influence values of a statistic. These will usually
be calculated by a call to |
strata |
A numeric vector or factor specifying which observations (and hence empirical influence values) come from which strata. |
The variance estimate calculated from L.
Davison, A. C. and Hinkley, D. V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.
# To estimate the variance of the ratio of means for the city data. ratio <- function(d,w) sum(d$x * w)/sum(d$u * w) var.linear(empinf(data = city, statistic = ratio))
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