The post is about Select Cases in SPSS as sometimes you may be interested in analyzing the specific part (subpart) of the available dataset. For example, you may be interested in getting descriptive or inferential statistics for males and females separately. One may also be interested in a certain age range or may want to study (say) only non-smokers. In such cases, one may use Select Cases in SPSS.
Select Cases in SPSS: Step by Step-by-Step Procedure
For illustrative purposes, I am using the “customer_dbase” file available in SPSS sample data files. I am assuming the gender variable to select male customers only and will present some descriptive statistics only for males. For this purpose follow these steps:
Step 1: Go to the Menu bar, select “Data” and then “Select Cases”.
Step 2: A new window called “Select Cases” will open.
Use of If statement for Select Cases in SPSS
Step 3: Tick the box called “If the condition is satisfied” as shown in the figure below.
Step 4: Click on the button “If” highlighted in the above picture.
Step 5: A new window called “Select Cases: If” will open.
Step 6: The left box of this dialog box contains all the variables from the data view. Choose the variable (using the left mouse button) that you want to select cases for and use the “arrow” button to move the selected variable to the right box.
Step 7: In this example, the variable gender (for which we want to select only men) is shifted from the left to the right box. In the right box, write “gender=0” (since men have the value 0 code in this dataset).
Step 8: Click on Continue and then the OK button. Now, only men are selected (and the women’s data values are temporarily filtered out from the dataset).
Re-Select Cases in SPSS
Note: To “re-select” all cases (complete dataset), you carry out the following steps:
Step a: Go to the Menu bar, choose “Data” and then “Select Cases”.
Step b: From the dialog box of “Select Cases”, tick the box called “All cases”, and then click on the OK button.
When you use the Select Cases in SPSS, a new variable called “filter” will be created in the dataset. Deleting this filter variable, the selection will disappear. The “un-selected” cases are crossed over in the data view windows.
Note: The selection will be applied to everything you do from the point you select cases until you remove the selection. In other words, all statistics, tables, and graphs will be based only on the selected individuals until you remove (or change) the selection.
Random Sample of Cases
There is another kind of selection too. For example, the random sample of cases, based on time or case range, and use the filter variable. The selected case can be copied to a new dataset or unselected cases can be deleted. For this purpose choose the appropriate option from the output section of the select cases dialog box.