| pike65sg {mixdist} | R Documentation |
Length-Frequency Data with Subsamples for Heming Lake Pike
Description
The raw data pikeraw give the lengths of 523 pike (Esox lucius), and there are known to
be five age-groups in the sample. After grouping the data, we take subsamples from some
intervals to determine the age group, and then obtain this data set.
The pike65sg data frame has 25 rows and 7 columns.
Usage
data(pike65sg)Format
This data frame contains the following columns:
- length
the boundaries of grouping intervals.
- freq
the frequencies of observation falling into each interval.
- age1
the numbers of observation in the subsamples belonging to the first age group.
- age2
the numbers of observation in the subsamples belonging to the second age group.
- age3
the numbers of observation in the subsamples belonging to the third age group.
- age4
the numbers of observation in the subsamples belonging to the fourth age group.
- age5
the numbers of observation in the subsamples belonging to the fifth age group.
Source
Macdonald, P.D.M. and T.J. Pitcher (1979). Age-groups from size-frequency data: a versatile and efficient method of analysing distribution mixtures. Journal of the Fisheries Research Board of Canada 36, 987-1001.
References
Macdonald, P.D.M. (1987). Analysis of length-frequency distributions. In R.C. Summerfelt and G.E. Hall [editors], Age and Growth of Fish, Iowa State University Press, Ames, Iowa. pp 371-384.
http://www.math.mcmaster.ca/peter/mix/demex/expike.html
Examples
data(pike65sg)
data(pikepar)
fit1 <- mix(pike65sg, pikepar, "gamma", mixconstr(consigma = "CCV"), usecondit = TRUE)
plot(fit1)
fit2 <- mix(pike65sg, pikepar, "gamma", usecondit = TRUE)
plot(fit2)