Last data update: 2014.03.03
R: Confidence Interval for the difference in Correlation...
Confidence Interval for the difference in Correlation Coefficients
Description
Will construct the CI for a difference in two correlations for a desired level
Usage
CIrdif(r1, r2, n1, n2, level = 0.95)
Arguments
r1
Correlation 1
r2
Correlation 2
n1
Sample size for r1
n2
Sample size for r2
level
Significance Level for constructing the CI, default is .95
Details
Constructs a confidence interval based on the standard error of the difference
of two correlations (r1 - r2) , sed <- sqrt((1-r1^2)/n1 + (1-r2^2)/n2)
Value
Returns a table with 4 elements
DifR
Observed Difference in correlations
SED
Standard error of the difference
LCL
Lower Confidence Limit of the CI
UCL
Upper Confidence Limit of the CI
Author(s)
Thomas D. Fletcher tom.fletcher.mp7e@statefarm.com
References
Cohen, J., Cohen, P., West, S. G., & Aiken, L. S. (2003).
Applied multiple regression/correlation analysis for the behavioral sciences (3rd ed.).
Mahwah, NJ: Lawrence Erlbaum.
See Also
rdif.nul
Examples
# From ch. 2 in Cohen et al (2003)
CIrdif(.657, .430, 62, 143)
Results