The raw data pikeraw give the lengths of 523 pike (Esox lucius), and there are known to
be five age-groups in the sample. We grouped the lengths over 25 intervals to obtain the grouped
data given as separate samples for each age group determined by scale reading.
The pikdat5 data frame has 25 rows and 6 columns.
data(pikdat5)This data frame contains the following columns:
the boundaries of grouping intervals.
the numbers of observation from each interval belonging to the first age group.
the numbers of observation from each interval belonging to the second age group.
the numbers of observation from each interval belonging to the third age group.
the numbers of observation from each interval belonging to the fourth age group.
the numbers of observation from each interval belonging to the fifth age group.
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.