miceadds: micombine.chisquare – R documentation

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micombine.chisquare

Combination of Chi Square Statistics of Multiply Imputed Datasets

Description

This function does inference for the χ^2 statistic based on multiply imputed datasets (see e.g. Enders, 2010, p. 239 ff.; Allison, 2002). This function is also denoted as the D_2 statistic.

Usage

micombine.chisquare(dk, df, display=TRUE, version=1)

Arguments

`dk`	Vector of chi square statistics
`df`	Degrees of freedom of χ^2 statistic
`display`	An optional logical indicating whether results should be printed at the R console.
`version`	Integer indicating which calculation formula should be used. The default `version=1` refers to the correct formula as in Enders (2010), while `version=0` uses an incorrect formula as printed in Allison (2001). The incorrect calculation `version=0` was included in miceadds versions smaller than version 2.0. See also http://statisticalhorizons.com/wp-content/uploads/2012/01/combchi.sas.

Value

A vector with following entries

`D`	Combined D_2 statistic which is approximately F-distributed with (`df`, `df2`) degrees of freedom
`p`	The p value corresponding to `D`
`df`	Numerator degrees of freedom
`df2`	Denominator degrees of freedom

References

Allison, P. D. (2002). Missing data. Newbury Park, CA: Sage.

Enders, C. K. (2010). Applied missing data analysis. Guilford Press.

Examples

#############################################################################
# EXAMPLE 1: Chi square values of analyses from 7 multiply imputed datasets
#############################################################################

# Vector of 7 chi square statistics
dk <- c(24.957, 18.051, 18.812, 17.362, 21.234, 18.615, 19.84)
dk.comb <- miceadds::micombine.chisquare(dk=dk, df=4 )
  ##  Combination of Chi Square Statistics for Multiply Imputed Data
  ##  Using 7 Imputed Data Sets
  ##  F(4, 482.06)=4.438     p=0.00157

miceadds

Some Additional Multiple Imputation Functions, Especially for 'mice'

v3.11-6

GPL (>= 2)

Authors

Alexander Robitzsch [aut,cre] (<https://orcid.org/0000-0002-8226-3132>), Simon Grund [aut] (<https://orcid.org/0000-0002-1290-8986>), Thorsten Henke [ctb]

Initial release

2021-01-21 11:48:47