what is the total number of daily cigarettes smoked by the participants in the first 50 observations

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

This exercise uses adapted versions of the data sets DEMO_B.sas7bdat, SMQ_B.sas7bdat and L06_B.sas7bdat, available on Canvas.

 

1. At the top of your SAS Editor file, please type your name and X.500 in the following format:

/*First Last     X.500 */
(1 points)

2. Check the contents (PROC CONTENTS) of the three SAS data sets provided.
(21 points)

a. How many variables are there in each data set? How many labels are there in each data set? What is the function of labels?
(8 points)

b. How many observations are there in each of the data sets?
(3 points)

c. What information is contained in the column labeled “#”? What option would you use to order this column in ascending order? Write the necessary code (use the data set DEMO_B).
(4 points)

d. You are interested in knowing more about current cigarette smokers and levels of cotinine, a biomarker associated to smoking.
How can you use PROC CONTENTS to find the two variables in the datasets that contain the information you are interested in? Report the variables names and which data set(s) contain these variables.

(6 points)

3. Use the appropriate procedure to print the data to the SAS output window (*NOTE: don’t confuse “print” with traditional hard copy printing - you should not print paper copies of the data for this question). For the following questions, use data set SMQ_B.sas7bdat.

Respondent Sequence Number (SEQN) is the variable that identifies participants by number.  Run the following command first, to order the dataset by descending SEQN.
(25 points)

 PROC SORT data = "FILEPATH/SMQ_B.sas7bdat";

by DESCENDING SEQN;

run;

 a. Based on the large number of observations in this dataset, it can be advantageous to only print a small number of observations. What code would you use to look at only the first (i.e. highest SEQN) 50 observations?
(4 points)

b. The variable SMD030 is labeled Age started smoking cigarets (sic) regularly.  Among the first 50 observations, which two participants reported starting to smoke at the earliest ages?  Report their SEQN and ages.

What statement can you use to assure only the relevant variables (SEQN and SMD030) will be printed? Include the code used in your answer.
(5 points)

c. What is the total number of daily cigarettes smoked by the participants in the first 50 observations?
Use the PRINT procedure, the SUM statement and the variable SMD070 (# cigarettes smoked per day now) to answer this question. Include the code used in your answer.
(5 points)

d. What Statement option would you use to print only observations corresponding to those who smoke cigarettes “some days”?  Write down the code used to include only the first 50 “some days” cigarette smokers (SMQ040 = 2) in your output.
(3 points)

e. The variable SMD090 contains information on the average number of cigarettes smoked per day over the past 30 days.
Using this variable and the correct statements within the PRINT procedure, report the total number of cigarettes smoked (over the past 30 days) among the first 50 observations of those who reported smoking “some days” (SMQ040 = 2).
Calculate (by hand) the mean number of cigarettes smoked daily among these 50 participants.
(4 points)

f. Repeat the previous step among those who reported smoking daily (SMQ040 = 1). Using the variable SMD090 and the correct statements within the PRINT procedure, report the total number of cigarettes smoked daily among first 50 observations.
Calculate (by hand) the mean number of cigarettes smoked daily among these 50 participants.
(4 points)

Attachments:

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