CRAN release 0.2.4

update NEWS

CRAN release 0.2.3

re-run the vignette and prepare for a new submission

CRAN release 0.2.2

add examples of applying the delta method to get standard errors for …

…the proportions of variances

CRAN release 0.2.1

fix a url issue in of the vignette

CRAN release 0.2.0

submit a new version to CRAN

CRAN release 0.1.0

submit to CRAN