Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road.

This is a continuation of a question I originally posted here concerning resampling. Thanks to the answers this site's members have provided I've moved away from that, so I thought it might be a good idea to re-post with a more appropriate title.

What I've been asked to do is look at some historical promotion data and see if changes made in the evaluation criteria for some condidates have been succesful in improving their promotion rate. My data is for three different organizational levels. Here it is:

Code:

```
Organizational Level 1
Promotion Cycle Promoted Not Promoted Subgroup NewCriteria
1 1307 180 0 0
2 1481 193 0 0
3 1213 99 0 0
4 1444 118 0 0
5 1668 113 0 0
6 1782 134 0 0
7 1579 126 0 0
8 1811 133 0 0
9 1848 114 0 0
1 175 21 1 0
2 161 27 1 0
3 158 13 1 0
4 155 13 1 0
5 203 28 1 0
6 183 17 1 0
7 157 16 1 0
8 185 10 1 1
9 205 11 1 1
```

Note the first column is "promotion cycle" and repeats...the first 9 lines are for the general corporate population minus the subgroup, the next 9 lines are the corresponding numbers for the subgroup. Make sense?

While my original reaction was that there a) isn't enough data here and b) there are way too many other factors influencing promotion rates, that answer wasn't acceptable to company management. So I'm trying to make the best of it....

Now, The Ecologist suggested using R to perform a binary logistic regression on this data. The only regression I've ever done is OLS and I'd never heard of R. So I've obtained a copy of R and have checked out Hosmer and Lemeshow's "Applied Logistic Regression" from the local library, but I'm not sure I have the time to learn all of this on my own and still meet managment's deadline.

So if anyone has any pointers...actual R command syntax is greatly appreciated.

My first instinct is to look solely at the numbers before the criteria change, to see if there is any statistical support to the perception that the members of the subgroup were being promoted at a lower rate and thus even needed a change in criteria. I'm unsure as to how to then proceed to evaluate the impact of the criteria change, particulalry since there are only two promotion cycles with the changes in place (for the other two organizational levels there are three cycles with the changes in place).

If you're still reading...thanks.