Search found 288 matches

by reason180
Sat May 25, 2024 1:15 pm
Forum: Statistics
Topic: Comparing different percentages of a sample?
Replies: 5
Views: 95

Re: Comparing different percentages of a sample?

You have to do a separate Chi Square test (or alternatively, a separate binomial test) on a subset of the data that contains only the two frequencies of interest. This is illustrated in the lower half of the image, above.
by reason180
Fri May 24, 2024 5:41 am
Forum: Statistics
Topic: Comparing different percentages of a sample?
Replies: 5
Views: 95

Re: Comparing different percentages of a sample?

Hi. I believe these are the kinds of analyses you want to conduct:
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by reason180
Tue May 21, 2024 4:48 pm
Forum: Help
Topic: Robust Anova
Replies: 3
Views: 122

Re: Robust Anova

Hi. In an ANOVA, each cell must include at least two cases (so that a within-cell variance can be computed). In contrast, you have one ANOVA cell in which the n is less than 2. See below.
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by reason180
Mon May 20, 2024 1:56 pm
Forum: Statistics
Topic: Logistic regression analysis for two treatment groups and two time points?
Replies: 13
Views: 740

Re: Logistic regression analysis for two treatment groups and two time points?

Sounds like you need to include A vs B as a factor, *and* you need to examine the interactions of that factor with other predictors.
by reason180
Sat May 18, 2024 10:12 pm
Forum: Statistics
Topic: Logistic regression analysis for two treatment groups and two time points?
Replies: 13
Views: 740

Re: Logistic regression analysis for two treatment groups and two time points?

If you're not interested in comparing treatment group A to treatment group B (and if you think your audience won't be interested in that comparison either), then you could simply code the data so that there's no distinction between A and B, and do just one analysis. (Doing two separate analysis halv...
by reason180
Mon May 06, 2024 9:06 pm
Forum: Help
Topic: Post hoc tests in Walrus (Robust ANOVA)
Replies: 6
Views: 4343

Re: Post hoc tests in Walrus (Robust ANOVA)

Oh. OK. So it looks like the other value of supp (i.e., "VC") is excluded completely from the interaction post-hoc test. So probably best to just remove the "interaction" post-hoc test table since, for whatever reason, it doesn't actually work right.
by reason180
Mon May 06, 2024 2:45 pm
Forum: Help
Topic: Post hoc tests in Walrus (Robust ANOVA)
Replies: 6
Views: 4343

Re: Post hoc tests in Walrus (Robust ANOVA)

I would also have doubts. For example, in a Walrus (bootstrap) robust ANOVA on the Tooth Growth Data, I think there should be 15 post-hoc comparison. But the output produces only 3.
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by reason180
Wed May 01, 2024 2:34 pm
Forum: General
Topic: Reorder output
Replies: 15
Views: 30116

Re: Reorder output

I found a non-technical work-around: I simply include a 'table of contents' telling the reader wear to look in the numbered-but-out-of-order analyses. For example . . . RESULTS Contents Response Time General Descriptives for RT (#5) ANOVA of RT (#3) Rj planned comparisons for ANOVA of RT (#6) Accura...