dr. engr. sami ur rahman data analysis lecture 6: spss
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Dr. Engr. Sami ur Rahman
Data AnalysisLecture 6: SPSS
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Courtesy:
Kevin Schoepp (Zayed University)
Kentaka Aruga
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Level of Measurement
Scale: A variable when its values are represented with a meaningful metric so that distance comparisons between values are appropriate. Examples: Age in years, Income in thousands of Rupees.
Nominal: A variable when its values are represented with no ranking.Example: Region, zip code, or Political party affiliation.
Ordinal: A variable when its values are represented with some ranking.Example, levels of service satisfaction from highly dissatisfied to highly satisfied.
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Introduction: What is SPSS?
Originally it is an acronym of Statistical Package for the Social Science but now it stands for Statistical Product and Service Solutions
One of the most popular statistical packages which can perform highly complex data manipulation and analysis with simple instructions
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Data Editor
Data Editor
Spreadsheet-like system for defining, entering, editing, and displaying data. Extension of the saved file will be “sav.”
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Output Viewer
Output Viewer
Displays output and errors. Extension of the saved file will be “spv.”
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The basics of managing data files
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Opening SPSS
The default window will have the data editorThere are two sheets in the window:
1. Data view 2. Variable view
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Data View window
The Data View window
This sheet is visible when you first open the Data Editor and this sheet contains the data
Click on the tab labeled Variable View
Click
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Variable View window
This sheet contains information about the data set that is stored with the dataset
NameThe first character of the variable name must be alphabeticVariable names must be unique, and have to be less than 64 characters.
Spaces are NOT allowed.
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Variable View window: Type
TypeClick on the ‘type’ box. The two basic types of variables that you will use are numeric and string. This column enables you to specify the type of variable.
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Variable View window: Width
WidthWidth allows you to determine the number of characters SPSS will allow to be entered for the variable
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Variable View window: Decimals
DecimalsNumber of decimals It has to be less than or equal to 16
3.14159265
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Variable View window: Label
LabelYou can specify the details of the variableYou can write characters with spaces up to 256 characters
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Variable View window: Values
ValuesThis is used and to suggest which numbers represent which categories when the variable represents a category
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Defining the value labels
Click the cell in the values column as shown belowFor the value, and the label, you can put up to 60 characters.After defining the values click add and then click OK.
Click
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Practice 1
How would you put the following information into SPSS?
Value = 1 represents Male and Value = 2 represents Female
Name Gender HeightJAUNITA 2 5.4SALLY 2 5.3DONNA 2 5.6SABRINA 2 5.7JOHN 1 5.7MARK 1 6ERIC 1 6.4BRUCE 1 5.9
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Practice 1 (Solution Sample)
Click
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Click
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Saving the data
To save the data file you created simply click ‘file’ and click ‘save as.’ You can save the file in different forms by clicking “Save as type.”
Click
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Sorting the data
Click ‘Data’ and then click Sort Cases
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Sorting the data (cont’d)
Double Click ‘Name of the students.’ Then click ok.
Click
Click
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Practice 2
How would you sort the data by the ‘Height’ of students in descending order?
AnswerClick data, sort cases, double click ‘height of students,’ click ‘descending,’ and finally click ok.
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Transforming data
Click ‘Transform’ and then click ‘Compute Variable…’
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Transforming data (cont’d)
Example: Adding a new variable named ‘lnheight’ which is the natural log of height Type in lnheight in the ‘Target Variable’ box. Then type in ‘ln(height)’ in the ‘Numeric Expression’ box. Click OK
Click
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Transforming data (cont’d)
A new variable ‘lnheight’ is added to the table
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Practice 3
Create a new variable named “sqrtheight” which is the square root of height.
Answer
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Thanks for your attention