A farmer who specialises in the production of carpet wool where the sheep are shorn twice per year is seeking a 75-mm-length clip from his Tukidale sheep. He believes that the proportion of sheep at each clip meeting this standard varies according to average rainfall during the six-month growing period and whether additional hand feeding of high protein sheep nuts occurs during the period (because of a shortage of grass cover in the paddocks). Hand-feeding is measured as 1 and no hand feeding as 0. sheep>