svyttest {survey} | R Documentation

## Design-based t-test

### Description

One-sample or two-sample t-test. This function is a wrapper for `svymean` in the one-sample case and for `svyglm` in the two-sample case. Degrees of freedom are `degf(design)` for the one-sample test and `degf(design)-1` for the two-sample case.

### Usage

    svyttest(formula, design,  ...)

### Arguments

`formula` | Formula, `outcome~group` for two-sample, `outcome~0` or `outcome~1` for one-sample
`design` | survey design object
`...` | for methods

### Value

Object of class `htest`

### See Also

`t.test`

### Examples

    data(api)
    dclus2<-svydesign(id=~dnum+snum, fpc=~fpc1+fpc2, data=apiclus2)
    svyttest(enroll~comp.imp, dclus2)

    svyttest(I(api00-api99)~0, dclus2)

[Package survey version 3.19 Index]