We are always very pleased to hear from anyone who spots any error (email details to mark@penguinsoft.co.uk).

Thanks for reported typos/errata are kindly acknowledged to:

John Cunha

Errata in third printing

P. 119. Second paragraph, line three:

"...then we'll define a calculated measure to divide the product total by the number that fell to produce the ratio, or proportion, of products with sales that fell."

should read:

"...then we'll define a calculated measure to divide the number that fell by the product total to produce the ratio, or proportion, of products with sales that fell."