Skip to contents

Ages of Morwong assigned from otoliths by two readers.

Source: R/Morwong3.R
Morwong3.Rd

Ages assigned by two different readers to the otoliths of Jackass Morwong (Nemadactylus macropterus).

Format

A data frame with 58 paired observations on the following 2 variables.

readerA

Ages assigned by Reader A

readerB

Ages assigned by Reader B

Source

From Table 7 of Restall, J.E., and K. Krusic-Golub. 2004. Development of jackass morwong age-length keys for 2000-2002. Final report to Australian Fisheries Management Authority. 13 pp. Primary Industries Research Victoria, Queenscliff. CSV file

Topic(s)

  • Age Comparison

  • Age Precision

  • Age Bias

  • Ageing Error

Examples

data(Morwong3)
str(Morwong3)
#> 'data.frame':	58 obs. of  2 variables:
#>  $ readerA: int  3 4 4 4 4 4 4 4 4 4 ...
#>  $ readerB: int  3 3 3 3 3 3 4 4 4 4 ...
head(Morwong3)
#>   readerA readerB
#> 1       3       3
#> 2       4       3
#> 3       4       3
#> 4       4       3
#> 5       4       3
#> 6       4       3
plot(readerB~readerA,data=Morwong3)

with(Morwong3,table(readerA,readerB))
#>        readerB
#> readerA  3  4  5  6  7  8  9 13
#>      3   1  0  0  0  0  0  0  0
#>      4   5 25  0  0  0  0  0  0
#>      5   0  1  7  0  0  0  0  0
#>      6   0  0  0 10  0  0  0  0
#>      7   0  0  0  0  6  0  0  0
#>      8   0  0  0  0  0  1  0  0
#>      9   0  0  0  0  0  0  1  0
#>      13  0  0  0  0  0  0  0  1