How To Select Cases In Spss

In this tutorial, we will look at how to select cases in SPSS and how to work with the resulting filtered data.

Data

The data we’re using for this guide comes from a hypothetical study that examined how long people overslept during a statistics lesson. Read: how to select instances in spss.The two variables of interest here are Gender, male or female, and Duration, which is the number of minutes elapsed since the start of a statistics lesson before the subject fell asleep. The average total time it takes a woman to fall asleep is 8.15 minutes. We want to compare this time with the average time for women in our sample. But the problem is that our sample contains data for both men and women, and any tests we run will be based on that. The question is how do we select only female cases, thus excluding males from any test we perform?

Select cases

This is where the select cases function comes in handy. To get started, click Data -> Select Cases.This will bring up the Select Case dialog box. This provides several different options for selecting cases. We will focus on the “If condition is met” option, you should choose this option.Once selected, you need to click the If… button (as above) Read more: How to change the rear tire on a student lawn mower with a cub bike The Select Case: If dialog box will appear. This is where you do the job of selecting female-only cases.The idea here is to build an expression in the text box at the top that selects the cases. You can see here we had “Gender = 0”, which tells SPSS that it should only select cases where the value of the Gender variable is 0 (Female = 0, Male = 1). Obviously, it is possible to construct more complex expressions than this simple test of equivalence. For example, you can ask SPSS to select the cases where Gender is Female and Height is greater than 68 inches (“Gender = 0 & Height > 68”), or where Duration is greater than 8 minutes or Height is small more than 60 inches (“Duration > 8 | Height < 60”). Once you have the expression set up, as above, press the Continue button, and then click OK in the Select Case dialog box. SPSS will now select the cases according to your instruction(s).

Selected cases

If you look at the Data View, you’ll see that things have changed to indicate that SPSS is now working with a subset of the original data set.As you can see, SPSS removed the left unselected cases. It has also introduced a new filter variable that specifies whether an instance is already selected. Finally, in the bottom right, it says Filter On, which tells you that any test or analysis you run will be on a subset of the data – that is, only on selected cases.

A sample T test

Test this by running a single-sample t-test to compare the average amount of time it takes women in the general population to fall asleep during a statistics lesson with the average for women in the sample. we. -> Test a sample T, and then set the test like this. Read more: how to use the heart of the sea in minecraft peYou can see we took Duration as the test variable and we’re comparing it to a population average of 8.15 minutes (the average amount of time it takes women in the general population to fall asleep). in a statistics lesson). to run tests.

Result

This is the result.The value of N here is 50, which tells you right away that the selected instances are active. Our dataset has 100 cases, of which 50 are women. This is a significant difference, with a value of -3.1 and a p value of 0.003.

Last word

There are a few things to note before we close, first that you can return the dataset to its unfiltered state by returning to the Select Case dialog (Data -> Select Case) and select All Instances (first option available). This will not delete the new filter variable, but will make it inactive. You will also notice that “Filter On” will no longer show up at the bottom right of the Data View. The other thing to note is that SPSS provides an alternative to Select Instances that work better in many cases. This is a Separator File, and it will be the subject of a future tutorial. *************** That’s all for this tutorial. You should now be able to select cases in SPSS and work with the resulting filtered data. Read more: how to move an object in unity

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