# proportion

1. ### Logistic Regression (very small proportion of 'yes')

Hi Everyone, I am working on a logistic regression problem (injury [y/n] predicted by air temperature and physical training program). Problem is that only 1.2% of the entire 10000 sample had an injury, and this 1.2% is almost equally distributed between the 2 pt programs. I am investigating...
2. ### Showing all categories in table even if no observations in some

Dear all, I have been having this problem for a while and tried a number of options after googling intensively without any success so I am hoping someone will be able to help! I am outputting proportion tables using the proportion command and I would like all the categories to appear in...
3. ### Margin of error for stratified survey sample

Hi all, first-time poster here. I have a stratified sample of respondents to a survey with the following make-up: So the total population is 7468 (and the total sample size is 1,008). I have also applied a set of weights to the data, which yields the following effective sample...
4. ### Kendall's W for testing similarity of proportions for non-ranked count data?

Hello forum, I can't find the answer to this anywhere, and I'd really appreciate a helping hand. :confused: I'm doing an MSc project and my supervisor has told me I need to use a Kendall's tau to compare conformity of non-ranked count data across a set of case studies. To explain...
5. ### Test Type Help

Can someone please help me? I just spent an hour writing a really detailed explanation of my stats project and it ended up getting deleted when I tried to preview post. Basically all my data is here I'm doing this for an AP Stats project and I'm really confused about what kinda of test...
6. ### Need urget help for one sample z test of proportions

Hi All, I need to confirm whether I am doing it correctly. Survey question is: Have you ever witnessed violent episodes/incidents in the last week? 1. NO 2. Yes. 58% witnessed/experienced violent incidents and others 38% didn't with 4% missing responses. I just need to test...
7. ### Need Help in STAT Project

Please help me I have this project for Stat in Excel. I need to answer the following questions in the the attached worksheet. I have completed questions 1 - 4, But I am having hard time figuring out question 5 - 9. Please help me I am desperate. thank you. The College Gift Shop wants to have...
8. ### Interpret results for a proportion end point.

I am doing a study to determine the efficacy of a drug. The efficacy of the drug is measured as the proportion of patients with HbA1c (diabetes control level)<7%. With the help from Talks Stats, I was able to determine a sample size of 73, where p = 95%, t (CI) = 1.96 (95%) and m =5% (using...
9. ### measuring interaction effects

I've spent months studying statistics texts, and I just cannot figure out how to do the following: I've got categories distinguished by some characteristic, say M vs. F, and then each of those categories has been assigned to one of two groups, say the treatment and the control group in an...
10. ### testing rates through time

Hello all, this seems like it should be a simple questions but our team cannot find an answer to the question. If I have data set up like the following (the numbers are the percent that react positively to the drug): Drug 2007 2008 2009 2010 A 59 62 61 62 B 50 49 58 61...
11. ### extremely small sample size

I have a Y variable that is measured in parts per million (ppm). However, it can be converted to a binomial variable comparing against a p=.1. The problem is only 4 samples were collected, and the response of telling them to collect more samples is not possible. Is there any statistical test...
12. ### Crosstabs Interpretation?

Hello, I'm trying to figure out how to interpret the proportion (Z test) calculated in the crosstab table in SPSS. In the attachment, in crosstab 1, i'm trying to analyze graduates as my DV by module #. By the numbers it seems that there would be significant difference in proportion on Module...
13. ### Multiple dependent proportions problem - Election

Hello, I have spent a few hours trying to untangle this problem by my knowledge of statistics appears to be too limited for me to come to a solution. I hope you can help me with this. I've tried computing the margin of error for each proportion, but I can't figure out how to deal with all...