The data consists of potato variety tuber yields for 9 varieties, all sown at twelve centres throughout the UK in the years 1983-87. So each item in the table represents the mean from five years of trials with the variety at that centre.

In addition there was available botanical, agronomic, disease and pest susceptibility scores for each of the varieties, all of which were rated on a scale 1-9 where 9 means the variety possesses the characteristic to a high degree, e.g. good drought resistance, pale crisp colour, high dry matter content.

Partial Least Squares Regression 27.2.96