Last week of notes
Last week of notes 400
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This 3 page Class Notes was uploaded by Dora Notetaker on Thursday December 3, 2015. The Class Notes belongs to 400 at University of Alabama at Birmingham taught by John E McNulty in Summer 2015. Since its upload, it has received 33 views. For similar materials see Research in Political Science in Public Relations at University of Alabama at Birmingham.
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Date Created: 12/03/15
PSC 4002D Research in Political Science Dr McNulty Last week of notes Week of Nov 30 Tue Dec1 Chisquare Used when looking at 2 categorical variables It is the formal measure of the difference btw what a proportionally normal table and the table you see The bigger the chisquare is the more likely that you can get a random distribution by random chance The size of the chisquare is conditioned by the degrees of freedom Difference in means test Used when you have 1 categorical 1 numeric variable It tells you if that difference is big enough that you can reject that it s just random variation It will calculate 2 means for 2 different groups separated by a category There s going to be some random variation your 2 means are never going to be the same SPSS is going to square them add them and take the square root Equa on Diff in means or Zsummed standard deviations 0 Z 95 So if you look at the difference between the average height of men and women and the difference is say 6 o 6 or 2 2 O 6 or 4 GPA s o GPA for men 31 o GPA for women 32 0 Difference O1 o O1 or 09 0 So the difference in means between 10 and 08 0 So we can t reject that there is no difference between men and women 0 The difference is so small 0 We accept the Null hypothesis Regression o 2 numerics 0 Example higher income students vs lower income students 0 Y 0L BX s O GPA 0L 3P arent s Income 8 Final Do couple of Chisquares Do couple of Difference in means tests Do couple of Regressions Interpret results Thurs Dec 3 How to do a difference in means test in SPSS Analyze Compare means Independent samples test Choose 1 numeric and 1 categorical variable 0 r s age when 1st child born 0 grouping variable Respondent s sex Define groups 0 1 and 2 0 Do this by looking at what Difference in means Find the 2 means on the chart Std Error value x 196 confidence interval 213 Mean difference is an estimate for the whole us population based on 2000 ppl in survey Your confidence in that estimate is defined by the standard deviation and the size of your sample which is how you get the standard error What is your confidence interval We always use 95 So we always have to multiply by 196 if 95 but SPSS does this for us so we don t have to multiply Interval not including 0 means you can reject the null hypothesis TTest Mean difference or Confidence interval STD error difference 213 or 1 96276 2672 1588 Can you reject the null hypothesis that there is no correlation between your variables Yes because 0 in not in between the confidence intervals How to do regression in SPSS Open STATES10 data set 0 Analyze 0 Regression 0 Linear 0 Choose 2 variables 0 Dep Median age 2008 o lndep of population foreign born Analyzing the results 0 t is a ratio 0 BSTD error t o Stg 263 o No there is not a relationship 0 P value in much higher than 005 New variables Age at 2008 Birth rate Std error is lower than the B Ratio is 19 t value over 2 is 95 significant