03-14-2013 09:43 AM
I need to answer the following questions based on a proc univariate normal plot and need help asap.
Can anyone help?
a. Violation of equal mean assumption using a residual plot
b. Violation of equal variance assumption using a residual plot.
c. Violation of normality assumption
Using the normal probability plot,
Using the box plot
Using a stem and leaf plot
conduct a statistical test (Ho, Ha, TS, pvalue and conclusion)
d. Flag potential outliers looking at studentized and jackknife residuals. (State the critical value you used ) What does this mean?
e. Flag any high leverage points. (State the critical value you used) . What does this mean?
f. Look at Cook’s D values and make conclusions. State critical value.
g. Make a conclusion about the PRESS statistic.
03-17-2013 06:16 PM
Usually, folks post the code they've tried, any error messages they get and a sample of the data they need to analyze. You have only posted questions, without any data or program. Saying that the plot is a UNIVARIATE plot is useful, but without anything concrete to go on, it's hard to comment.
There are quite a few .EDU resources here. Google is your friend.
03-18-2013 02:48 PM
These are questions about regression diagnostic plots. Submit
ODS GRAPHICS ON;
and run PROC REG. Several of these plots are created automatically.