All Questions
8 questions
1
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0
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162
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Testing whether means of several gamma distributions are equal?
I have conducted measurements on bubble sizes on 20 positions in the same foam, each of the 20 positions following a gamma distribution. From the boxplot the mean values appear very similar... Now I ...
- 11
0
votes
0
answers
143
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Statistical question about ANOVA, Tukey and t-test (also R-related)
I am new to statistics and have to do some analysing for a beginner project. However, I am so confused right now and have nobody that I can ask.
About the project experiment: We conducted a between-...
- 433
1
vote
1
answer
1k
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question about ANOVA post hoc analysis
I understand that people use Games Howell, Tukey or sometimes pair-wise t-test (with correction) test as post hoc analysis procedures following one-way ANOVA.
My question is following. For example, ...
- 1,058
1
vote
0
answers
2k
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Calculating Tukey HSD for a subset of comparisons - can I do this?
A colleague has about 50 samples, each with 2 conditions (treated and non-treated). The data is continuous and normal, and there are 3 data points in each sample-treatment combination. They'd like to ...
- 2,312
1
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0
answers
299
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Identify outlier in a group with a test statistic
I am trying to identify the outliers from a group for a research article. I wanted to know if there was a formal statistical method of doing so. Here is an example of the data:
There are 500 students ...
- 11
2
votes
1
answer
3k
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what statistical test should i use for three groups with different sample sizes?
What statistical test should I use if I have three independent groups of interval data and would want to check whether their means are significantly different? I'd also note that the samples sizes of ...
- 21
3
votes
2
answers
251
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Why are there not obvious improvements over Tukey's method?
Is there a book that explains why there aren't better standard techniques than Tukey and ANOVA, for example?
For comparison consider for example I read about the null hypothesis one-sample $t$ test ...
- 1,082
12
votes
1
answer
8k
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Two-sample $t$-test vs Tukey's method
Even if the $F$ statistic in an ANOVA test is significant, we may need to do further testing before drawing conclusions. The most common method for doing this involves the use of a multiple ...
- 1,082