| Preface | p. xv |
| Preview | p. 1 |
| Introduction | p. 1 |
| Different types of research study | p. 1 |
| Bias and confounding in observational studies | p. 4 |
| The sample survey | p. 12 |
| Data analysis | p. 12 |
| Experiments and quasi-experiments | p. 13 |
| Ethical considerations | p. 15 |
| Planning and carrying out a research study | p. 16 |
| The sample survey | p. 17 |
| Introduction | p. 17 |
| Simple random sampling | p. 19 |
| The distribution of sample means | p. 20 |
| Estimation of totals and proportions | p. 23 |
| Determining sample sizes with simple random sampling | p. 26 |
| Stratified sampling | p. 28 |
| Sample size allocation for stratified samples | p. 30 |
| Stratified sampling for proportions | p. 32 |
| Poststratification | p. 33 |
| Quota sampling | p. 34 |
| Ratio and regression estimation | p. 34 |
| Cluster sampling | p. 37 |
| Systematic sampling | p. 38 |
| Multi-stage sampling | p. 39 |
| Non-sampling errors | p. 40 |
| Biased procedures | p. 41 |
| Bias introduced during data collection | p. 42 |
| Processing errors | p. 43 |
| Methods of data collection | p. 43 |
| Designing a questionnaire | p. 44 |
| Summary and further reading | p. 46 |
| Exercises | p. 47 |
| The 1989 Mayoral election in Dunedin | p. 47 |
| Checklist for planning a sample survey | p. 57 |
| Other sampling designs | p. 58 |
| Introduction | p. 58 |
| Mark--recapture sampling | p. 58 |
| Removal sampling | p. 62 |
| Transect sampling | p. 66 |
| Size-biased sampling | p. 66 |
| Sampling positions of objects in space | p. 68 |
| Distance-based methods | p. 70 |
| Quadrat counts | p. 75 |
| Sampling of quadrats | p. 77 |
| Summary and further reading | p. 78 |
| Exercises | p. 79 |
| Estimating the size of a population of mice | p. 79 |
| Site location in prehistoric Thailand | p. 82 |
| The linear regression model | p. 87 |
| Introduction | p. 87 |
| The simple linear regression model | p. 87 |
| Estimation and tests with simple linear regression | p. 88 |
| Multiple linear regression | p. 92 |
| The extra sum of squares principle | p. 94 |
| Assessing the assumptions of a regression model | p. 98 |
| Residual plots | p. 100 |
| Tests on residuals | p. 107 |
| The Durbin--Watson test | p. 108 |
| Summary and further reading | p. 112 |
| Exercises | p. 113 |
| The loss of sales in a store due to a fire | p. 120 |
| Experimental designs to assess the effect of a treatment | p. 132 |
| Introduction | p. 132 |
| External and internal validity | p. 133 |
| Pseudoreplication | p. 135 |
| The one-group pretest--posttest design | p. 137 |
| The static group comparison | p. 138 |
| The importance of a comparable control group | p. 139 |
| Regression to the mean | p. 140 |
| The comparative posttest design | p. 142 |
| The comparative change design | p. 144 |
| The comparative change design without randomization | p. 148 |
| The regression discontinuity design | p. 148 |
| Regression adjustments for confounding variables | p. 152 |
| Matching | p. 156 |
| Summary and further reading | p. 161 |
| Exercises | p. 161 |
| The Lanarkshire milk experiment | p. 163 |
| Interrupted time series | p. 167 |
| Introduction | p. 167 |
| Analysis with the interrupted time series design | p. 168 |
| Analysis with the comparative time series design | p. 175 |
| Summary and further reading | p. 177 |
| Exercises | p. 178 |
| Fluoridation in Birmingham | p. 182 |
| More advanced experimental designs | p. 188 |
| Introduction | p. 188 |
| Factorial experiments and the analysis of variance | p. 188 |
| Some general considerations | p. 194 |
| Transformation of data | p. 199 |
| Experiments with three or more factors | p. 201 |
| Higher order interactions | p. 204 |
| Blocking | p. 205 |
| Latin squares | p. 208 |
| Nested factors | p. 209 |
| Split-plot experiments in agricultural research | p. 210 |
| Other uses of the split-plot design | p. 213 |
| Repeated measures experiments | p. 215 |
| The assumption of compound symmetry | p. 217 |
| Analysis of variance by multiple regression | p. 219 |
| Ancillary analyses | p. 224 |
| Summary and further reading | p. 225 |
| Exercises | p. 225 |
| An experiment on lockstitch seams | p. 227 |
| Some special types of data | p. 234 |
| Introduction | p. 234 |
| The analysis of count data | p. 236 |
| Chi-squared tests on count data | p. 237 |
| McNemar's test for correlated proportions | p. 242 |
| Log-linear models | p. 244 |
| Extraneous variance | p. 252 |
| Using base rates | p. 253 |
| The analysis of proportion data | p. 255 |
| Survival data | p. 261 |
| Generalized linear modelling | p. 263 |
| Multivariate data | p. 264 |
| Summary and further reading | p. 266 |
| Exercises | p. 267 |
| The location of prehistoric Maya sites | p. 270 |
| Computer intensive statistics | p. 286 |
| Introduction | p. 286 |
| Randomization tests | p. 288 |
| Determining the number of randomizations required | p. 292 |
| Confidence limits by randomization | p. 293 |
| Monte Carlo tests | p. 294 |
| Jackknifing | p. 298 |
| Bootstrapping | p. 302 |
| Summary and further reading | p. 304 |
| Exercise | p. 305 |
| The solar activity cycle in the past | p. 305 |
| Ethical considerations | p. 312 |
| Introduction | p. 312 |
| Obligations to society | p. 312 |
| Obligations to funders and employers | p. 313 |
| Obligations to colleagues | p. 314 |
| Obligations to human subjects | p. 314 |
| Experiments on animals | p. 316 |
| Summary and further reading | p. 316 |
| A clinical trial on ECMO | p. 317 |
| Synthesis: carrying out a research study | p. 321 |
| Introduction | p. 321 |
| Deciding on objectives | p. 321 |
| Planning the collection of data | p. 324 |
| Sample size determination | p. 325 |
| Collecting data | p. 334 |
| Analysing data | p. 334 |
| The research report | p. 335 |
| References | p. 336 |
| Author index | p. 345 |
| Subject index | p. 348 |
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