One of the homework questions fails to meet the assumption of normality required for t-tests. We did not discuss data transformation or distribution-free ...
When you did the single variance test with STATA (sdtesti 30 . 2.59 2.13) did you know to reject the null hypothesis because p > .05? In this example, are...
It is good that you detected it. Please make note of the nonnormality but go ahead and do the the ttest the way you would if there had been no problems. We...
Actually, I rarely ever use sdtest because it generates too many type I errors. I showed it in class so that you would at least know that it existed, that some...
In week 10 we will cover the following:<br><br>1) units 54, 55, and 56<br>2) review units 29 and 31<br>3) we will collect assingment #4<br>4) prepare for final...
I have discovered the error with reg1.dta, it was saved as a version 7 data file and cannot be read using Stata 6. I will check other files to make sue they...
Assignment 2 asks you to cross validate your initial results using a second data set. If you don't clear the first data set from Stata memory before trying to...
There was an error in the naep codebook that is now corrected. The variable ethnic was missing one category. The correct categories are:<br>1-asian ...
I need to clarify my original post. If you follow the steps of the first version of the handout I put together for Assign. 2, you need to use the CLEAR command...
You can get detailed info on your variables by using the codebook command after you have load the data set. This will give you the range, standard deviation,...
After you have loaded your data set, you can use the edit commmand to bring up a spreadsheet containing your data. This is useful when you want to delete an...
Prof. Ender tells me that the low shrinkage (& even expansion) we saw in the cross validation of the HSBS data is a known issue with that data set. It you use...
