brazerzkidaibrasil.blogg.se - Mann whitney u test pspp

MANN WHITNEY U TEST PSPP HOW TO

I have collected the most usual things people ask in this section. Over time, a lot of people have asked questions about Likert scales in the comments section of this post. You can use this variable for descriptive statistics (e.g., estimate the central tendency and dispersion), cross-tabulations, correlations and so on… This will be in numerical form (1, 2, 3, …), but you can change it to a verbal descriptor for consistency (Figure 3). SPSS will automatically generate a new variable, which will appear at the end of your dataset. Repeat with all the variables, separating them with comas.

Place the cursor in the brackets, select the variables you want to merge, and click on the arrow.

At this point, the following formula should appear in the numerical expression box: Median (, )

From the functions that appear select the Median.

Scroll down the Function Group, and select Statistical.

Assign a name to the new variable (e.g., Sweets).

2 Four steps for combining Likert type responses You should now see the following dialogue box. Merging the variablesįrom the top menu bar in SPSS, select Transform -> Compute variable. When you have created the dataset by typing your data into SPSS, and after you have tested for the internal consistency of the scale (use Cronbach’s α), it’s time to create a new variable. 1 SPSS screenshot showing responses to Likert-type items Your starting point for summarising Likert scale data with SPSS will be a dataset similar to the one shown in Figure 1, below.įig.

MANN WHITNEY U TEST PSPP HOW TO

Here’s how to merge the Likert items Starting out I will also assume that you have already established that your scale is internally consistent, so I will focus only on the technical aspects of merging the variables. I assume that you will already know how to define variables and values, how to toggle between the numerical expression and verbal descriptor of the values (i.e., you can make SPSS show responses as “strongly agree/agree/disagree/strongly disagree” or as “1/2/3/4”), and how to key in data. Using the same example as above, I need to create a new ‘super-variable’, which shows the mean of items (1), (2) and (3) for each respondent. The same steps can be modified to add up the data. In this post, I will show you how to estimate the median, because this is slightly harder. We can do this in two ways: adding the data or estimating the median. In order to interpret these data, we need to summarise the data in the scale. For instance, if I want to measure people’s attitudes towards sweets, I might ask them to record what they think about the following statements: 1. If you want to read up on Likert scales before you go on, you can find some information in this post.īefore we start Why should you summarise Likert scale dataĮlsewhere in this blog, I have written that a Likert scale might consist of several items that measure a similar underlying construct (a latent variable).

This post will give you some advice about using SPSS to summarise data that were generated with a Likert scale.