JMP® Means Business: Statistical Models for Management

Chapter 12. Proportions

• 12.1 Introduction 316

• 12.2 Proportions from a Single Sample 317

  • 12.2.1 Introduction to Proportions 317

  • 12.2.2 Detail Example: A Survey to Evaluate Brand Preference 318

  • 12.2.3 Sample Size Considerations with Single Proportions 323

• 12.3 Chi-Square Test for Equality of k Proportions 327

  • 12.3.1 Introduction to Chi-Square 327

  • 12.3.2 Detail Example: Default Rates on a Specific Type of Loan (CBA Loan) by Credit Rating 327

  • 12.3.3 The Pearson Chi-Square Statistic 331

• 12.4 Summary 334

• 12.5 Problems 335

• 12.6 Case Study: Incomplete Rebate Submissions 337

12.1 Introduction

The next two chapters deal with categorical data. As discussed in Chapter 1, JMP uses the terms nominal or ordinal for such data. Categorical data occur regularly in many business ...