baycheck: Population estimate of type of Bay Checkerspot butterfly
In UsingR: Data Sets, Etc. for the Text "Using R for Introductory Statistics", Second Edition
baycheck R Documentation
Population estimate of type of Bay Checkerspot butterfly
Description
Estimates of the population of a type of Bay Checkerspot butterfly
near San Francisco.
Usage
data(baycheck)
Format
A data frame with 27 observations on the following 2 variables.
- year
a numeric vector
- Nt
estimated number
Source
From chapter 4 of Morris and Doak, Quantitative Conservation
Biology: Theory and Practice of Population Viability Analysis,
Sinauer Associates, 2003.
Examples
data(baycheck)
plot(Nt ~ year,baycheck)
## fit Ricker model N_{t+1} = N_t e^{-rt}W_t
n = length(baycheck$year)
yt = with(baycheck,log(Nt[-1]/Nt[-n]))
nt = with(baycheck,Nt[-n])
lm(yt ~ nt,baycheck)
UsingR documentation built on March 18, 2022, 7:32 p.m.
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| baycheck | R Documentation |
Population estimate of type of Bay Checkerspot butterfly
Description
Estimates of the population of a type of Bay Checkerspot butterfly near San Francisco.
Usage
data(baycheck)
Format
A data frame with 27 observations on the following 2 variables.
- year
a numeric vector
- Nt
estimated number
Source
From chapter 4 of Morris and Doak, Quantitative Conservation Biology: Theory and Practice of Population Viability Analysis, Sinauer Associates, 2003.
Examples
data(baycheck)
plot(Nt ~ year,baycheck)
## fit Ricker model N_{t+1} = N_t e^{-rt}W_t
n = length(baycheck$year)
yt = with(baycheck,log(Nt[-1]/Nt[-n]))
nt = with(baycheck,Nt[-n])
lm(yt ~ nt,baycheck)
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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