SPSS Statistics Multiple Separating Groups This is important as SPSS Statistics cannot tell the difference between columns that contain different variables and columns that contain a repeated variable. If you have a lot of time points and/or conditions, labelling the variables logically is important because otherwise it can become very confusing determining which variable is which. It does not matter what you call these "related" columns (you could have called them weight1 and weight2, for example), as long the columns make sense to you. Here, we have labelled their weight at the beginning of the weight-loss programme as " Weight_Pre" and their weight after the weight-loss programme as " Weight_Post". What if you have more than two categories of your "grouping variable"? Simple, just add more numbers with, we recommend, corresponding text labels. We can see in this example that the first three subjects were males and the last four subjects were females. You do not need to add text labels SPSS Statistics will work fine without them but it can provide extra clarity when analysing your data (especially as text labels are often used in the output instead of the numbers this helps greatly).
#SPSS CODE VALIDATING INSTRUMENT HOW TO#
How to do this is explained in our guide on Working with Variables. In this example, we can see that "1" and "2" are replaced by " Male" and " Female", respectively. Because we labelled the numbers using the value attribute we can use the Value Label Button to switch to the text version of the "grouping variable" categories. Looking at the columns on the left we can see that we have created a "grouping variable" called "Gender" that has two categories: " 1" and " 2". By using the value attribute we can label these numbers as representing males and females, respectively. For example, we label "males" as " 1" and "females" as " 2". We do this by labelling our groups numerically. This is a separate column that includes information on which group a subject belongs to. To identify which subjects were males and which were females, you need to create a "grouping variable" in SPSS Statistics. You want to label some of your individuals as female and others as male. A common example is when differentiating between gender. In this sense, you could call the groups "mutually-exclusive". They are groups where the individuals in each group are unique (i.e., no person is in more than one group). Separate groups are more commonly called between-subjects factors or independent groups. The only variation to this is discussed later in this guide when we have to enter repeated measures.
To add more variables, simply add more columns - one column per variable. How to label variable columns is in our Working with Variables guide. So, even if we ignored the Subject column, we can see that one individual was 1.55 m tall and weighed 56 kg, looking at the Height and Weight columns, respectively. However, SPSS Statistics does not need you to enter this column, and it is mostly for you to be able to better visualize your data. The Subject column has been added so that it is clear that each individual is placed on a separate row. Published with written permission from SPSS Statistics, IBM Corporation.
#SPSS CODE VALIDATING INSTRUMENT PLUS#
We shall now look at the three most common tasks you face when entering data into SPSS Statistics, plus three more advanced setups: Equally, if a row contains more than one person's data, you have also made a mistake. If you find that you have an individual's data on more than one row then you have made a mistake. Therefore, when entering data into SPSS Statistics you must put one person's data on one row only. For the purposes of this explanation, we shall assume that a case is an individual. Usually, a case is an individual, but it can also be a commercial product or a biological cell (or something else entirely). A case is the "object" which you are measuring in someway. The principle behind entering data in almost all cases in SPSS Statistics is to enter each unique case on a new row. SPSS Statistics sets out its data in a spreadsheet-like manner. Entering Data in SPSS Statistics The "one person, one row" Rule
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