Signal Detection Theory and Roc Analysis in Psychology and Diagnostics: Collected Papers

By John A. Swets | Go to book overview

Appendix: Computer Programs for Fitting ROCs
Described here are five computer programs (or sets of programs) for fitting ROCS. They are ordered according to the time of their appearance; the later programs give increasing coverage of types of experimental conditions. They all give estimates of one or more measures of discrimination acuity and decision criterion along with variance information.
1. DORFMAN, ALF. An improved version of the 1969 RSCORE program published by Donald Dorfman and E. Alf, Jr. , called RSCORE II, was listed in the book Evaluation of Diagnostic Systems: Methods from Signal Detection Theory by J. A. Swets and R. M. Pickett; New York: Academic Press, 1982. For rating data, it gives the binormal ROC area index Az, some variants of d́ for binormal ROCs of non-unit slope, and the variances of the estimates. In addition, it gives z-values for decision criteria. The program prints out the variance-covariance matrix of the binormal- model parameter estimates.
2. CENTOR. Robert M. Centor has made available The ROC Analyzer. Again from rating data, this program gives both the "nonparametric" and parametric (Gaussian) ROC area measure, along with other parameters. A new version is Windows based and gives a graphical representation of the ROC. One can contact Robert M. Centor, M.D., via email at RCENTOR@GIM.MEB.UAB.EDU.
3. METZ. Charles E. Metz provides a set of four programs. ROCFIT is an enhanced version of the Dorfman-Alf program that provides a more flexible input format, checks input data for "degeneracy," uses somewhat more robust numerical methods, and provides additional output such as a list of the coordinates of representative points on the fitted binormal ROC. LABROC accommodates data collected on a continuous (rather than discrete categorical) scale and, thus, is useful for ROC analyses that involve probability judgments and results of

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Signal Detection Theory and Roc Analysis in Psychology and Diagnostics: Collected Papers
Table of contents

Table of contents

  • Scientific Psychology Series ii
  • Title Page iii
  • Contents v
  • Preface vii
  • Acknowledgments xi
  • Introduction xiii
  • I - Theory, Data, and Measures 1
  • 1 - The Relative Operating Characteristic in Psychology 7
  • Summary 28
  • References and Notes 29
  • 2 - Form of Empirical Rocs in Discrimination and Diagnostic Tasks 31
  • References 56
  • 3 - Indices of Discrimination or Diagnostic Accuracy 59
  • References 95
  • II - Accuracy and Efficacy of Diagnoses 97
  • 4 - Measuring the Accuracy of Diagnostic Systems 99
  • Concluding Remarks 115
  • References and Notes 116
  • 5 - Choosing the Right Decision Threshold in High-Stakes Diagnostics 121
  • Concluding Remarks 140
  • References 141
  • III - Applications in Various Diagnostic Fields 143
  • 6 - Medical Imaging Techniques: A Review 147
  • Summary 164
  • References 165
  • 7 - Medical Imaging Techniques: An Illustrative Study 169
  • 8 - Enhancing and Evaluating Diagnostic Accuracy 185
  • References 199
  • Appendix a Feature List 199
  • Appendix B Checklist 201
  • 9 - Information Retrieval Methods 205
  • Appendix a Feature List 233
  • 10 - Predictive Validities of Aptitude Tests 235
  • References 248
  • 11 - Accuracy and Response Bias in Survey Research 249
  • Conclusions 267
  • References 267
  • 12 - System Operator Response to Warnings of Danger 269
  • References 290
  • Appendix: Computer Programs for Fitting Rocs 293
  • Author Index 295
  • Subject Index 303
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