Tasks
Download the zipped file Assignment2.zip from the folder Data Sets under the Files section. Expand the zipped file for the following SAS data sets:
· Demographics.sas7bdat: contain demographic information of all members.
· Flying_Activities.sas7bdat: contain members’ flying activities between 1 Jan 2018 and 31 Dec 2021.
You can find the variable dictionary Assignment2_Variabledictionary.xlsx. Do not change the contents of these data sets unless you are told to do so explicitly.
Write a SAS program for the following tasks. Mark the code of each task by using a proper comment statement, such as ‘/*Task 2a*/’.
Task 1:
Write a LIBNAME statement to define a SAS library in SAS Studio so that you can access the above-described data sets (and any others) via the library.
Task 2:
2a: Write a DATA step to create a SAS data set named as Demographics_New. This data set must contain all observations and variables in Demographics and a new variable called Tenure. Tenure is defined as the number of full months from an observation’s Join_Date till 1 Jan 2021. For example, if an observation’s Join_Date is 2 Jan 2020, then the observation’s Tenure value is 11 months. Place Demographics_New in the library created in Task 1. {Hint: SAS function INTCK(‘month’, ‘2jan2020’d, ‘1jan2021’d,’continuous’) returns a value of 11 months. The ‘month’ and ‘continuous’ are system keywords for the INTCK function.}
A subset of the observations in Demographics_New is shown here for illustration purposes:
2b: Write a DATA step to modify the Gender values in Demographics_New so that if an observation’s Gender value is either ‘f’ or ‘m’, replace it by ‘F’ or ‘M’, respectively. Name the modified data set as Demographics_New again and keep it in the library created in Task 1. (Be aware that this new Demographics_New will overwrite the original Demographics_New.)
2c: Write appropriate SAS procedure statements for the purpose of comparing the average Tenure between male and female members in Demographics_New.
Task 3:
3a: Write appropriate SAS procedure statements for sorting the data set Flying_Activities by the variable Member_Id. Name the sorted data set as Sorted_Activities and place it in the Work library of SAS Studio.
3b: Write a DATA step to reshape Sorted_Activities by collapsing the observations with the same Member_Id value into a single observation. Name this new SAS data set as Collapsed_Activities and place it in the Work library of SAS. Create the following variables and keep only these variables, but not necessary in the listed order, for each observation in Collapsed_Activities:
Variable Name
Description
Member_Id
Member’s identity.
Air_CityU_2018
Number of times flew on CityU Airline (i.e. Airline value = ‘CityU’) in 2018.
Air_CityU_2019
Number of times flew on CityU Airline in 2019.
Air_CityU_2020
Number of times flew on CityU Airline in 2020.
Air_NonCityU_2018
Number of times flew on non-CityU Airlines (i.e. Airline value ^= ‘CityU’) in 2018.
Air_NonCityU_2019
Number of times flew on non-CityU Airlines in 2019.
Air_NonCityU_2020
Number of times flew on non-CityU Airlines in 2020.
FlyBonus_Earned_2018
Total bonus points earned from flying in 2018.
FlyBonus_Earned_2019
Total bonus points earned from flying in 2019.
FlyBonus_Earned_2020
Total bonus points earned from flying in 2020.
A subset of the observations in Collapsed_Activities is shown here for illustration purposes:
Task 4:
4a: Write appropriate SAS procedure statements for sorting the data set Demographics_New as created in Task 2b by the variable Member_Id in ascending order. Replace the original Demographics_New with the sorted data set.
4b: The data set Demographics_New is supposed to contain all members’ information. However, However, not all members in Collapsed_Activities are also contained in Demographics_New or vice versa. Write one DATA step for creating three SAS data sets. The three data sets must have these characteristics:
· One data set contains only the observations of Collapsed_Activities with Member_Id that do not appear in Demographics_New. Name this data set Redundant_Activities and place it in the Work library of SAS Studio. Keep only the variables of Collapsed_Activities in Redundant_Activities.
· A second data contains the observations of Collapsed_Activities with Member_Id that also appear in Demographics_New. Name this data set Collapsed_Activities2 and place it in the Work library of SAS Studio. Keep only the variables of Collapsed_Activities in Collapsed_Activities2.
· A third data set contains the observations of Demographic_New with Members_ID that do not appear in Collapsed_Activities. Name this data set Inactive_Members and place it in the Work library of SAS Studio. Keep only the variables of Demographic_New in Inactive_Members.
You must accomplish Task 4b with one DATA step only.
A subset of the observations in Redundant_Activities is shown here for illustration purposes:
A subset of the observations in Collapsed_Activities2 is shown here for illustration purposes:
A subset of the observations in Inactive_Members is shown here for illustration purposes: