# invt: Combine p values using inverse t method In metap: Meta-Analysis of Significance Values

 invt R Documentation

## Combine p values using inverse t method

### Description

Combine p values using the inverse t method\loadmathjax

### Usage

invt(p, k, data = NULL, subset = NULL, na.action = na.fail,
log.p = FALSE)
## S3 method for class 'invt'
print(x, ...)


### Arguments

 p \sigvec k A vector of degrees of freedom to use, see details data Optional data frame containing variables subset Optional vector of logicals to specify a subset of the \mjseqnp-values na.action A function indicating what should happen when data contains NAs log.p \logp x An object of class ‘invt’ ... Other arguments to be passed through

### Details

Defined as \mjdeqn\frac\sum_i=1^n t_k_i(p_i) \sqrt\sum_i=1^n \frack_ik_i - 2 > z(\alpha) \sum t (p) / \sqrt\sum k / (k - 2) > z(\alpha)

If k is a single value it is used for all the p of which there are n. If any value of \mjseqnk_i\le2 then the corresponding \mjseqnp_i is not included.

\ltle

two

\plotmethod

### Value

An object of class ‘invt’ and ‘metap’, a list with entries

 z Value of z p Associated p-value validp The input vector with the illegal values removed

Michael Dewey

### References

\insertRef

becker94metap

See also plotp
data(dat.metap)
beckerp <- dat.metap$beckerp invt(beckerp, 50) all.equal(exp(invt(beckerp, 50, log.p = TRUE)$p), invt(beckerp, 50)\$p)