How to Design and Report Experiments

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by Andy Field


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  Index

  α-level, 151, 154, 156

  ABA design, see Single-subject experimental designs

  ABAB design, see Single-subject experimental designs

  Abbreviations and statistical symbols, 335

  Algebra (revision of), 119–20

  Analysis of Covariance, 223–31

  And reporting results, 230–1

  And SPSS, 225–9

  When to use, 223–4

  See also Effect size

  Analysis of Variance, 172–222

  Names, 174

  One-way independent ANOVA, 174–83, 224

  One-way repeated measures ANOVA, 183–91, 224

  Two-way independent ANOVA, 191–201, 224

  Two-way mixed ANOVA, 201–12, 224

  Two-way repeated measures ANOVA, 212–22, 224

  See also One-way independent ANOVA, One-way repeated measures ANOVA, Two-way independent ANOVA, Two-way mixed ANOVA, Two-way repeated measures ANOVA

  ANCOVA, see Analysis of Covariance

  ANOVA, see Analysis of Variance

  APA format, 302–3, 305–7

  Appendices, 356–7

  β-Ievel, 152, 154, 156

  Bar chart, 137–9

  Behavioural measures, 44

  Behaviourism, 28

  Beer-goggles effect, 213, 223

  Between-groups experimental designs, 74–9,

  Advantages of, 74–5,

  Disadvantages of, 75–7,

  Examples of, 77–9

  Bimodal distribution, 115

  Bonferroni correction, 173, 178, 180, 191, 208, 217, 247, 255

  Box-whisker plot, 237–8

  Broca, and study of brain size and intelligence, 55–7

  Causality, 10–27

  And correlation, 15

  Direction of, 13

  Inferring, 15

  Chi-Squared test, 260–2

  Assumptions of, 261–2,

  Goodness of fit version, 260

  Problems in interpreting results, 261

  Test of association between two variables, 261

  Chi-Squared test versus correlation test, 269

  Coefficient of determination, see r2

  Cognitivism, 28

  Confidence intervals, 135, 165–6, 176, 217

  Confidentiality of participants, 100–1

  Confounding variable, 12–13, 223–4

  Content validity, see Validity

  Contrasts, see Planned comparisons

  Control conditions, 20–3

  Conventionalists, 16

  Correlational method, 3, 10, 26–7

  Correlation test versus t-test, 270

  Counterbalancing, 42

  Covariates, 223, 229

  Criterion validity, see Validity

  Cronbach’s alpha, see Reliability

  Databases

  Medline, 35–6

  Psylnfo (psyclit), 35

  Web of science, 35

  Debriefing of participants, 100

  Deception of participants, 99–100

  Degrees of freedom (df), 129

  Dependent t-test, see t-Test

  Dependent variable, see Variables

  Determinism, 27

  Deviation, 124

  See also Standard deviation, Sums of squares

  Dogs

  Licking their backsides, 48–9

  Licking their genitals, 235

  Ecological validity, see Validity

  Effect size, 152–4

  For ANCOVA, 230

  Benchmarks, 153

  For dependent t-test, 170–1

  For Friedman’s ANOVA, 254–5

  For independent t-test, 166

  For Kruskal-Wallis test, 248–9

  For Mann-Whitney test, 238

  For one-way independent ANOVA, 180–1

  For one-way repeated measures ANOVA, 189–90

  And sample size, 171–2

  And statistical significance, 171

  For two-way independent ANOVA, 197–200

  For two-way mixed ANOVA, 210–11

  For two-way repeated measures ANOVA, 220–1

  For Wilcoxon’s signed-rank test, 242–3

  See also Eta-squared, Omega-squared

  Empiricism, 3

  Error bars, 137–9, 175, 202

  Eta-squared (η2), 180

  Ethical issues in experimentation, 98–101

  Evaluative learning, 22–3

  Experimental designs, 70–96

  Between-groups vs within-subjects, 70

  Choosing which to use, 96–8

  Logical basis of, 90–5

  Experimental hypothesis, 141–2, 145, 149

  Experimental method, 3, 5, 10, 26–7

  Experimenter effects, 60

  External validity, see Validity

  Factorial validity, see Validity

  Falsification, 17–20

  Flow-chart, for selecting an appropriate statistical test, 274–5

  Frequency, 112

  Frequency distribution (histogram), 111

  Friedman’s ANOVA, 250–6

  And reporting results, 255–6

  And SPSS, 251–4

  When to use, 250

  See also Effect size

  Gabriel’s test, see Post hoc tests

  Games-Howell test, see Post hoc tests

  Greenhouse-Geisser es
timate, see Sphericity

  Heart rate, 44

  Histogram, see Frequency distribution

  Hochberg’s GT2, see Post hoc tests

  Homogeneity of regression slopes, 224

  Homogeneity of variance, 159, 165, 176, 182, 193, 203–4, 226

  See also Levene’s test

  Huynh-Feldt estimate, see Sphericity

  Independent t-test, see t-Test

  Independent variable, see Variables

  Inductivism, 13

  Interaction graph, 139, 197–8, 209–10

  See also Interaction term

  Interaction term, 194, 196, 219–20

  See also Interaction graph

  Interquartile range, 237

  Interrupted time-series designs, 69

  Interval data, 8, 266–7

  See also Levels of measurement, Measurement

  Kolmogorov-Smirnov test, 160–1, 235, 240, 244, 250

  Kruskal-Wallis test, 244–50

  And reporting results, 249–50

  And SPSS, 245–8

  When to use, 244

  See also Effect size

  Kurtosis, 114

  Leptokurtic, 114

  Platykurtic, 114

  Latin squares designs, 84–6

  Law of large numbers, 111

  Leptokurtic, see Kurtosis

  Levene’s test, 160, 165, 176, 182, 193, 203–4, 226–7

  Likert scales, 45–6

  Line chart, 137–9

  Lower-bound estimate, see Sphericity

  Main effect, 194

  Mann-Whitney test, 235–9

  And reporting results, 239

  And SPSS, 236–8

  When to use, 235

  See also Effect size

  Materials, 40–2

  Mauchly’s test, see Sphericity

  Mean, 118, 120, 121–31, 133

  As the most accurate model, 126–7

  Reporting the mean, 136–7

  Mean of squared errors, MS, 127–8, 177

  Model mean of squared errors, MSM, 177–8, 181, 189–90, 199, 210, 224, 230

  Residual mean of squared errors, MSR, 177–8, 181, 189–90, 199, 210, 224, 228, 230

  Measurement, 3–5

  Levels of, 4, 6–9

  Measurement error, 5, 48–9

  Self-report measures, 5, 44–6

  See also Likert scales, Visual-analogue scales

  Median, 115, 117–18

  Medline, see Databases

 

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