Thursday, November 30, 2006
Friday, November 17, 2006
MacLin's Advanced Statistics Blog
Analysis of Covariance Handouts
Homework due next Tuesday.
Using the data from the general survey (the one that we have been using all the time) conduct an analysis of covariance using the sex and race as dependent measures and the respondent’s education as the independent measure. Control for the effects of the father’s education by using it a covariant.
If there is an interaction you will need to graph the figure and refer to it in you write up. Make sure that you discuss the results and discuss them.
Let me know if you have any questions.
Additionally you can do exercise 16.24 for extra credit. You do not have to do “e” or “f”
Saturday, November 11, 2006
Study Guide Exam 4
Class,
You should have already scheduled exam 4 with either me or Jen by now.
For exam 4 I will test you over all of the procedures we have covered so far, but factorial designs, repeated measures, and multiple regression will be emphasized.
You should be able to write up the results and write a brief discussion just like we did for exam 3.
You should be able to make figures and format them as I showed you in class.
There will be no syntax, but you will be asked to calculate power for either a t-test or an anova.
I will construct the exam to parallel your homework so you are best to study that.
I also realize that you haven't received much feedback on your multiple regression write ups so far so I take this into consideration.
Let me know if you have any questions.
Take care,
--Dr. M
Friday, November 10, 2006
Homework Due Tuesday
For the homework due Tuesday, go through the General Survey data and conduct at three regression analyses using dependant variables that we haven't used in our examples in class (you can use the independant variables). Use a different regression method for each one (so one should be enter, one should be stepwise, and one should be backwards). For each analysis, compute residuals and do a cross validation. Report and discuss your findings. Make sure to include all output that you are basing your findings on so Jen can see where you are getting your values...
Tuesday, November 07, 2006
HomeworkDue Friday
Using the data from exercise 15.4 conduct a regression analysis first usign the enter, then stepwise, and then backwards regression. Based on your reading of section 15.10 (page 520) discuss the different results and how the different methods might have lead up to those results.
Using the data from exercise 15.16 use stepwise regression to analyse the variables. Report and discuss yoru results. Next use the regression equation to calculate Y hat. Using the vales obtained from Y hat, calculate the residuals for the for the regression line. Next, repeat this using the enter method. Compare your results from the two methods, indicate which one produced a better fitting line.
Using the data from 15.16, run a stepwise and then enter method analysis request SPSS to conduct the diagnostics. Report the statistics from diagnostic test and compare them with the results from your previous analyese above (where you calculated your own residuals).
G*Power Tutorial
I went through the G*Power slides for both the t-tests and the anova and combined them with a step by step procedure of how to download G*Power to a flash drive and then how to run the analyses. You can find the tutorual at http://www.uni.edu/~maclino/as/g_power.pdf
Let me know if this helps.
--Dr. M
Thursday, November 02, 2006
Homework due tuesday
For the homework on due Tuesday we finish working out of chapter 14 - repeated measures design. Follow through the example starting on page 468 to 474. Report and discuss your findings (include a figure).
Next work through the problem staring on page 480. Report and discuss your findings (include a figure).
Do exercise 14.14 - report and discuss your findings (include a figure).