Description Usage Format Source Examples
Total numbers of salmon released (salmon.released
) and surviving
(salmon.surviving
) in 12 streams, 6 with brook trout present
and
6 with brook trout absent
. The proportion of salmon surviving
(proportion.surviving
) is given for each stream.
1 2 3 |
BrookTrout
is a data frame with 12 observations on the following
4 variables. BrookTrout2
is a different summary of the same
study and gives survival rates for chinook in different years.
trout
a factor with levels absent
and present
indicating whether brook trout are absent or present in the stream
salmon.released
a numeric vector of the total number of salmon released
salmon.surviving
a numeric vector of the number of salmon surviving
proportion.surviving
a numeric vector of the proportion of salmon surviving
Levin, P.S., S. Achord, B.E. Fiest, and R.W. Zabel. 2002. Non-indigenous brook trout and the demise of Pacific salmon: a forgotten threat? Proceedings of the Royal Society of London, Series B, Biological Sciences 269: 1663-1670.
1 2 3 4 5 6 7 8 9 10 11 12 | data(BrookTrout)
data(BrookTrout2)
str(BrookTrout)
str(BrookTrout2)
bwplot(proportion.surviving ~ trout, BrookTrout)
aggregate( proportion.surviving ~ trout, BrookTrout, FUN = favstats)
if (require(Hmisc)) {
summary( proportion.surviving ~ trout, BrookTrout, fun = favstats)
}
|
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