Ages of Morwong assigned from otoliths by Reader A at two times.

Description

Ages assigned at two different times by Reader A to the otoliths of Jackass Morwong (Nemadactylus macropterus).

Format

A data frame with 217 paired observations on the following 2 variables.

• first: Ages assigned on the first reading
• second: Ages assigned on the second reading

Topic(s)

• Age Comparison
• Age Precision
• Age Bias
• Ageing Error

Source

From Table 5 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. Available at http://web-test.afma.gov.au/wp-content/uploads/2010/07/r03_1724b.pdf.

Examples

data(Morwong1)
str(Morwong1)
head(Morwong1)
plot(second~first,data=Morwong1)
xtabs(~first+second,data=Morwong1)