vardpoor (version 0.2.0.9.2)

lin.ratio: Linearization of the ratio estimator

Description

Computes linearized variable for the ratio estimator.

Usage

lin.ratio(Y, Z, weight, Dom=NULL)

Arguments

Y

Matrix of numerator variables. Any object convertable to data.table with numeric values, NA values are not allowed.

Z

Matrix of denominator variables. Any object convertable to data.table with numeric values, NA values are not allowed.

weight

Weight variable. One dimentional object convertable to one-column data.frame

Dom

Optional variables used to define population domains. If supplied, the linearized variables are computed for each domain. An object convertable to data.table

Value

• The function returns the data.table of the linearized variables for the ratio estimator.

References

Carl-Erik Sarndal, Bengt Swensson, Jan Wretman. Model Assisted Survey Sampling. Springer-Verlag, 1992, p.178.

See Also

domain, vardom, vardomh,

Examples

Y <- data.table(rchisq(10, 3))
Z <- data.table(rchisq(10, 3))
weights <- rep(2, 10)
lin.ratio(Y, Z, weights)