MAc (version 1.1.1)

atten: Correction for Attenuation

Description

Used to correct for attenuated effect sizes due to measurement unreliability.

Usage

atten(es, xx, yy, data)

Arguments

es

r or z' effect size.

xx

Column for reliability of predictor variable ("independent variable").

yy

Column for reliability of outcome variable ("dependent variable").

data

data.frame with the above values.

Value

A new column for es corrected for attenuation (es.corrected) will be added to the data, for those xx & yy columns with complete data.

References

Hunter, J. E., Schmidt, F. L. (2004). Methods of meta-analysis (2nd edition). Thousand Oaks, CA: Sage.

Examples

# NOT RUN {
# Sample data:

id <-c(1, 1:19)
n <-c(10,20,13,22,28,12,12,36,19,12,36,75,33,121,37,14,40,16,14,20)
r <-c(.68,.56,.23,.64,.49,-.04,.49,.33,.58,.18,-.11,.27,.26,.40,.49,
 .51,.40,.34,.42,.16)
xx <-c(.88,.86,.83,.64,.89,.84,.89,.83,.99,.88,.81,.77,.86,.70,.79,
 .71,.80,.74,.82,.86)  # Reliability of "independent variable"
yy <-c(.99,.86,.83,.94,.89,.94,.89,.93,.99,.88,.81,.77,.86,.70,.79,
 .71,.80,.94,.92,.96)  # Reliability of "dependent variable"
   
dat<-data.frame(id, n, r, xx,yy)

# Example        
atten(es= r, xx = xx, yy = yy, data= dat) 
# }