Closed haziqj closed 8 years ago
After investigating this, I've found that the S3 method sigma()
was only released in the stats
package with R version 3.3.0. From the release notes:
sigma()
with methods for extracting the estimated standard deviation aka “residual standard deviation” from a fitted model.Prior to R v3.3.0, sigma()
was an S3 method in lme4.
On CRAN submission,