abd (version 0.2-6)

BrookTrout: Salmon Survival in the Presence of Brook Trout

Description

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.

source

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.

Examples

data(BrookTrout)
data(BrookTrout2)
str(BrookTrout)
str(BrookTrout2)

bwplot(proportion.surviving ~ trout, BrookTrout)

aggregate( proportion.surviving ~ trout, BrookTrout, FUN = favstats)
summary( proportion.surviving ~ trout, BrookTrout, fun = favstats)