Measures of Association

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Measures of Association. 10/30/2012. Readings. Chapter 7 Tests of Significance and Measures of Association (Pollock) (pp. 169-179) Chapter 11 Doing Your Own Political Analysis (Pollock Workbook) . Homework. Some Due Today More Due 11/6 Chapter 7 Pollock Workbook Question 1

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### Measures of Association

10/30/2012

• Chapter 7 Tests of Significance and Measures of Association (Pollock) (pp. 169-179)
• Chapter 11 Doing Your Own Political Analysis (Pollock Workbook)
Homework
• Some Due Today
• More Due 11/6
• Chapter 7 Pollock Workbook
• Question 1
• A, B, C, D, E, F
• Question 2
• A, B, C, D
• Question 3

-A, B, C, D

• Question 5
• A, B, C, D, E
Office Hours For the Week
• When
• Wednesday 11-1
• Thursday 8-12
• And appointment
• http://cookpolitical.com/
Course Learning Objectives
• Students will be able to interpret and explain empirical data.
• As this course fulfills the Computational Skills portion of the University degree plan, students will achieve competency in conducting statistical data analysis using the SPSS software program.
Why Hypothesis Testing
• To determine whether a relationship exists between two variablesand did not arise by chance. (Statistical Significance)
• To measure the strength of the relationship between an independent and a dependent variable? (association)
Measures of association

Nominal

Ordinal

Strength

Significance

Direction!

• Strength
• Significance
Questions
• What Percent of Americans believe that Jesus will definitely return in the next 40 years?
• State the full directional relationship found in the cross tab. (people who are not born again Christians are….)
An Example
• Maurice Duverger (1957) wrote that "the simple-majority single-ballot system favors the two-party system" and that "multimember districts favor multiple parties". Hypothesis- PR systems will have more parties
• D.V. -enpp3_democ (Effective number of parliamentary parties: 3 cats)
• IV-pr_sys (PR system)
Another One
• From the states.sav
• Hypothesis- States that are more secular, will have fewer restrictions on abortion
• DV- abortlaw3
• IV- secularism3
Putting Outputs into Word
• An Advantage of SPSS is incorporating outputs into documents
• The best way to do this is to paste it as an image within your document
Copying From SPSS
• Right Click on your output and choose copy
The “Paste Special Command”
• The paste special command gives you the most options
• Pasting as an image allows you to resize and move your output around the document

Step 1

Step 2

What Not to Do
• DON’T Just Cut and paste
• It is more trouble than it is worth (resizing columns, spacing, etc)
A Third Variable
• the relationship between two variables may be spurious, weak or even too strong
• "controlling" for a third variable is a method of removing or separating the effects of another variable.
• This gets at the underlying relationship