combine.test {survcomp} | R Documentation

## Function to combine probabilities

### Description

The function combines several p-value estimated from the same null hypothesis in different studies involving independent data.

### Usage

    combine.test(p, weight, method = c("fisher", "z.transform", "logit"),
      hetero = FALSE, na.rm = FALSE)

### Arguments

`p` | vector of p-values
`weight` | vector of weights (e.g. sample size of each study)
`method` | `fisher` for the Fisher's combined probability test, `z.transform` for the Z-transformed test, `logit` for the weighted Z-method
`hetero` | `TRUE` is the heterogeneity should be taken into account, `FALSE` otherwise
`na.rm` | `TRUE` if the missing values should be removed from the data, `FALSE` otherwise

### Details

The p-values must be one-sided and computed from the same null hypothesis.

### Value

p-value

### Author(s)

Benjamin Haibe-Kains

### References

Whitlock, M. C. (2005) "Combining probability from independent tests: the weighted Z-method is superior to Fisher's approach", J. Evol. Biol., 18, pages 1368–1373.

### See Also

`test.hetero.test`

### Examples

    p <- c(0.01, 0.13, 0.07, 0.2)
    w <- c(100, 50, 200, 30)

    #with equal weights
    combine.test(p=p, method="z.transform")
    #with p-values weighted by the sample size of the studies
    combine.test(p=p, weight=w, method="z.transform")

[Package survcomp version 1.40.0 Index]