This book largely covers the field that is generally referred to as 'statistics', but as our Preface has sought to establish, we have departed in a number of respects from the way in which this subject is conventionally taught to under- and post- graduates. In particular, our preferences are for integrating data analysis with computing skills and for not burdening the student with formulae. These predilec- tions constitute a departure from many, if not most, treatments of this subject. We prefer the term 'quantitative data analysis' because the emphasis is on the under- standing and analysis of data rather than on the precise nature of the statistical techniques themselves.