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Exploration & description The data exploration that follows disregards the cases for which the response variable weaning weight was not recorded. This can be achieved by first using the GenStat Spread → Restrict/Filter command to exclude missing values for weaning weight. Two-way frequency tables can then be produced by Stats → Summary Statistics → Frequency Tables … and then completing the dialog box that appears to give counts of the numbers of lambs recorded with weaning weights each year and for each lamb genotype. The numbers of lambs (DD and RD) born to Dorper ewes were more during the former three than the latter three years.
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