SAS® Certification Prep Guide: Advanced Programming for SAS®9 Second Edition

Chapter 13. Creating Samples and Indexes

• Overview 450

  • Introduction 450

  • Objectives 450

  • Prerequisites 451

• Creating a Systematic Sample from a Known Number of Observations 451

  • Example 451

  • Example 452

• Creating a Systematic Sample from an Unknown Number of Observations 453

  • Example 454

• Creating a Random Sample with Replacement 454

  • Using the RANUNI Function 454

  • Example 455

  • Using a Multiplier with the RANUNI Function 455

  • Using the CEIL Function 455

  • Example 456

  • Example 456

• Creating a Random Sample without Replacement 457

  • Example 457

• Using Indexes 458

  • Types of Indexes 459

• Creating Indexes in the DATA Step 460

  • Examples 460

  • Example 461

  • Determining Whether SAS Is Using an Index 462

  • Example 462

• Managing Indexes with PROC DATASETS 462

  • Example 463

• Managing Indexes with PROC SQL 464

  • Example ...