SAS认证220道练习题及详细答案.pdfVIP

SAS Certificate Base Practice Questions and Detailed Answers Chapter 1: Basic Concepts Chapter 2: Referencing Files and Setting Options Chapter 3: Editing and Debugging SAS Programs Chapter 4: Creating List Reports Chapter 5: Creating SAS Data Sets from Raw Data Chapter 6: Understanding DATA Step Processing Chapter 7: Creating and Applying User-Defined Formats Chapter 8: Creating Enhanced List and Summary Reports Chapter 9: Producing Descriptive Statistics Chapter 10: Producing HTML Output Chapter 11: Creating and Managing Variables Chapter 12: Reading SAS Data Sets Chapter 13: Combining SAS Data Sets Chapter 14: Transforming Data with SAS Functions Chapter 15: Generating Data with DO Loops Chapter 16: Processing Variables with Arrays Chapter 17: Reading Raw Data in Fixed Fields Chapter 18: Reading Free-Format Data Chapter 19: Reading Date and Time Values Chapter 20: Creating a Single Observation from Multiple Records Chapter 21: Creating Multiple Observations from a Single Record Chapter 22: Reading Hierarchical Files 1 Chapter 1: Basic Concepts Answer Key 1. How many observations and variables does the data set below contain? a. 3 observations, 4 variables b. 3 observations, 3 variables c. 4 observations, 3 variables d. cant tell because some values are missing Correct c answer: Rows in the data set are called observations, and columns are called variables. Missing values dont affect the structure of the data set. 2. How many program steps are executed when the program below is processed? data user.tables; infile jobs; input date name $ job $; run; proc sort data=user.tables; by name;