# var.linear

From boot v1.3-24
by Brian Ripley

##### Linear Variance Estimate

Estimates the variance of a statistic from its empirical influence values.

- Keywords
- nonparametric

##### Usage

`var.linear(L, strata = NULL)`

##### Arguments

- L
Vector of the empirical influence values of a statistic. These will usually be calculated by a call to

`empinf`

.- strata
A numeric vector or factor specifying which observations (and hence empirical influence values) come from which strata.

##### Value

The variance estimate calculated from `L`

.

##### References

Davison, A. C. and Hinkley, D. V. (1997) *Bootstrap Methods and Their Application*. Cambridge University Press.

##### See Also

##### Examples

```
# NOT RUN {
# 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))
# }
```

*Documentation reproduced from package boot, version 1.3-24, License: Unlimited*

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