Versions of IBM SPSS Statistics

This book is based primarily on version 21 of IBM SPSS Statistics (I'm just going to call it SPSS from now on); however, don't be fooled too much by version numbers because SPSS release 'new' versions each year, and as you might imagine, not much changes in a year. Occasionally IBM have a major overhaul, but most of the time you can get by with a book that doesn't explicitly cover the latest version (or indeed the version you're using): a bit of common sense will see you through. So, this edition, although dealing with version 21, will happily cater for earlier versions (certainly back to version 18). I also suspect it'll be useful with versions 22 onwards when they appear (although it's always a possibility that IBM may decide to change everything just to annoy me).