home *** CD-ROM | disk | FTP | other *** search
- TITLE(equal.spread @@ Check for equal spreads)
- USAGE(
- equal.spread(data, group, use.mean=false)
- )
- ARGUMENTS(
- ARG(data @@ vector containing the data.)
- ARG(group @@ vector of group labels.)
- ARG(use.mean @@ if LANG(true),
- plots log standard deviations versus log means, otherwise
- log midspreads versus log medians.)
- )
- DESCRIPTION(
- LANG(equal.spread) plots log midspreads (standard deviations)
- versus log medians (means) to check for
- equal group spreads when comparing groups,
- and calculates the slope of a line fitted through
- the plot.
- LANG(equal.spread) draws the plot and returns the slope of the fitted line.)
-