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Otolith age of Atlantic croaker (Micropogonias undulatus) from two readers.

Format

A data frame of 317 observations on the following 2 variables:

reader1

Age assigned by the first reader

reader2

Age assigned by the second reader

Source

From Figure 2 in Chapter 1 (Atlantic Croaker) of the VMRC Final Report on Finfish Ageing, 1999 by the Center for Quantitative Fisheries Ecology at Old Dominion University. CSV file

Topic(s)

  • Age Comparison

  • Age Precision

  • Age Bias

  • Ageing Error

Examples

data(Croaker1)
str(Croaker1)
#> 'data.frame':	317 obs. of  2 variables:
#>  $ reader1: int  1 1 1 2 2 2 2 2 2 2 ...
#>  $ reader2: int  1 1 1 2 2 2 2 2 2 2 ...
head(Croaker1)
#>   reader1 reader2
#> 1       1       1
#> 2       1       1
#> 3       1       1
#> 4       2       2
#> 5       2       2
#> 6       2       2
plot(reader2~reader1,data=Croaker1)

xtabs(~reader1+reader2,data=Croaker1)
#>        reader2
#> reader1  1  2  3  4  5  6  7  8  9 10
#>      1   3  0  0  0  0  0  0  0  0  0
#>      2   0 34  0  0  0  0  0  0  0  0
#>      3   0  1 29  0  0  0  0  0  0  0
#>      4   0  0  1 17  3  0  0  0  0  0
#>      5   0  0  0  1 58  4  0  0  0  0
#>      6   0  0  0  0  0 26  2  0  0  0
#>      7   0  0  0  0  0  5 52  0  0  0
#>      8   0  0  0  0  0  0  1 36  2  0
#>      9   0  0  0  0  0  0  0  1 39  0
#>      10  0  0  0  0  0  0  0  0  0  1
#>      11  0  0  0  0  0  0  0  0  0  1