SAS Chapter 15 Review

Within the data set furn.bookcase, the variable Finish contains values such as ash, cherry, teak, and matte-black. Which of the following creates a subset of the data in which the values of Finish contain the string walnut? Make the search for the string case-insensitive.

• data work.bookcase;

  set furn.bookcase;

  if find(finish,'walnut',I);

  run;

• data work.bookcase;

  set furn.bookcase;

  if find(finish,'walnut','I')>0;

  run;

Which function correctly calculates the average of the variables Var1, Var2, Var3, and Var4?

• mean(of var1-var4)

• mean(of var1, var4)

• mean (var1-var4)

• mean(var1, var4)

Due to growth within the 919 area code, the telephone exchange 555 is being reassigned to the 920 area code. The data set Clients.Piedmont includes the variable Phone, which contains telephone numbers in the form 919-555-1234. Which of the following programs will correctly change the values of Phone?

• data work.piedmont(drop=areacode exchange);

  set clients.piedmont;

  Areacode=substr(phone,1,3);

  Exchange=substr(phone,5,3);

  if areacode='919' and exchange='555'

  then substr(phone,1,3)='920';

  run;

• data work.piedmont(drop=areacode exchange);

  set clients.piedmont;

  Areacode=substr(phone,1,3);

  Exchange=substr(phone,5,3);

  if areacode='919' and exchange='555'

  then phone=substr('920',1,3);

  run;

• data work.piedmont(drop=areacode exchange);

  set clients.piedmont;

  Areacode=substr(phone,1,3);

  Exchange=substr(phone,5,3);

  if areacode='919' and exchange='555'

  then phone=scan('920',1,3);

  run;

• data work.piedmont(drop=areacode exchange);

  set clients.piedmont;

  Areacode=substr(phone,1,3);

  Exchange=substr(phone,5,3);

  if areacode='919' and exchange='555'

  then scan(phone,1,3)='920';

  run;

The variable IDCode contains values such as 123FA and 321MB. The fourth character identifies the gender. How do you assign these character codes to a new variable named Gender?

• Gender=substr(idcode,4);

• Gender =substr(idcode,4,1);

• Gender =scan(idcode,4,1);

• Gender =scan(idcode,4);

A typical value for the numeric variable SiteNum is 12.3. Which statement correctly converts the values of SiteNum to character values when creating the variable Location?

• Location=dept || '/' || put(sitenum,4.);

• Location=dept || '/' || put(sitenum,3.);

• Location=dept || '/' || input(sitenum,4.);

• Location=dept || '/' || input(sitenum,3.);

The variable Address2 contains values such as Piscataway, NJ. How do you assign the two-letter state abbreviations to a new variable named State?

• State=substr(address2,2);

• State=substr(address2,13,2);

• State=scan(address2,13,2);

• State=scan(address2,2);

Within the data set Hrd.Temp, PayRate is a character variable and Hours is a numeric variable. What happens when the following program is run?

data work.temp;

set hrd.temp;

Salary=payrate*hours;

run;

• SAS converts the values of Hours to character values. A message is written to the log.

• SAS converts the values of Hours to character values. No message is written to the log

• SAS converts the values of PayRate to numeric values. No message is written to the log.

• SAS converts the values of PayRate to numeric values. A message is written to the log.

Suppose the YEARCUTOFF= system option is set to 1920. Which MDY function creates the date value for January 3, 2020?

• MDY(1,3,20)

• MDY(3,1,20)

• MDY(1,3,2020)

• MDY(3,1,2020)

Which function calculates the average of the variables Var1, Var2, Var3, and Var4?

• mean(Var1,Var4)

• mean(Var1,Var4)

• mean(of Var1,Var4)

• mean(of Var1-Var4)

Within the data set Furnitur.Bookcase, the variable Finish contains values such as

ash/cherry/teak/matte-black. Which of the following creates a subset of the data in which the values of Finish contain the string walnut? Make the search for the string case-insensitive.

• data work.bookcase;

  set furnitur.bookcase;

  if find(lowcase(finish),walnut) = 0;

  run;

• data work.bookcase;

  set furnitur.bookcase;

  if find(finish,'walnut') > 0;

  run;

• data work.bookcase;

  set furnitur.bookcase;

  if find(finish,'walnut', 'i') > 0;

  run;

• data work.bookcase;

  set furnitur.bookcase;

  if find(finish,’walnut’, 'i') = 0;

  run;