Description Usage Format Source References Examples
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.
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This data frame contains the following columns:
the boundaries of grouping intervals.
the frequencies of observation falling into each interval.
the numbers of observation in the subsamples belonging to the first age group.
the numbers of observation in the subsamples belonging to the second age group.
the numbers of observation in the subsamples belonging to the third age group.
the numbers of observation in the subsamples belonging to the fourth age group.
the numbers of observation in the subsamples belonging to the fifth age group.
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.
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
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