multiple comparisons

1. when does multiple comparisons become a consideration?

Typically in research you collect data to test a specific a priori hypothesis. But nowadays many people generate hypotheses and then access appropriate datasets in online databases that have already been sampled and stored for general use. Is it valid to keep generating & testing new hypotheses...
2. Correct for multiple comparisons with two time points and contingent relations

I have a reviewer of a manuscript requesting corrections for multiple comparisons in a type of analysis that is not correlational or group comparisons and so I am uncertain whether this is appropriate. The analysis is looking at contingencies between two speakers (i.e., the probability that...
3. Multiple comparisons to a reference value - which test?

Hi, if I wanted to compare a sample to a fixed reference value, I would use the one-sample t-test (or the nonparametric one-sample Wilcoxon signed-rank test). However, I don't know which test I should use if I want to compare several different samples to that single reference value. Dunnet's...
4. 2 Way ANOVA or multiple t tests with correction?

Hi all, I am trying to do some data analysis, and I'm not sure whether to use a 2 way ANOVA or multiple t tests with Bonferroni correction. I am looking at the effect of a chemical on bacterial binding to different polymers. So for each polymer, I want to know if there is a difference in...
5. When to control for multiple comparisons?

I have a test that I have given people, and it is looking at two particular variables. Each variable has two item types. So either an item is, for example, nice or mean, or passionate or dispassionate. I wanted to look at whether responses to nice and mean items were differentially affected...
6. Proc Mixed effect interpretation

Hello, I am analyzing an experiment in which we tested the effect of different treatments on trauma. So, for example, blood pressure (and other parameters) is followed in animals exposed to trauma and treated in different ways. I am using the Proc mixed procedure to analyze my data with...
7. False Coverage Rate - adjusting confidence intervals for multiple comparisons

Hello, I could do with some help regarding correcting confidence intervals for multiple comparisons. I have carried out a number of multiple regression analyses, which has given me various different p values. I have used the Benjamini Hochberg procedure to determine which p values survive...
8. adjustment for multiple comparisons in meta-analysis

I wrote a meta-analysis on the use of two different drug regimens on the symptoms associated to endometriosis. Four papers were included in the meta-analysis. The two regimens were evaluated as to the results in four outcomes: recurrence of the disease as seen at ultrasonography during...
9. comparing means when the control group has 2 subsets of data

Hi there I have prospective study looking at functionality after an injury; let's say a big toe injury. I have the injured group (N=44) that has suffered an injury on one big toe (the other foot is "non-injured"), and control group with healthy toes (N=15). I have a functionality score for the...
10. No margins for chi-squared test with multiple categories?

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11. one way anova vs. multiple comparisons

I'm using matlab to study significance different in mean for deviation in the thre directions 8vrt, lng and lat). with one way anova i get no significance (0.0532) but with multiple comparisons i get significance between lng and lat directions. when i apply anova on just lng and lat i got...
12. Simple 4 group comparison of means problem

I'll start by saying that I'm a neuroscience PhD student and have searched a long time for a solution to this problem but I can't find one. If you just have time to give a rough idea or point in the right direction then I'm grateful for any help. I am measuring the frequency of the same...
13. Multiple comparisons in SEM

Hello, I am using the Multiple Group Analysis function in AMOS to compare three groups. I am using pairwise comparisons to compare group 1 with groups 2 and 3. Should I be applying a multiple comparisons technique, such as Bonferroni? I am using a maximum likelihood procedure, based on...
14. Different results between Kruskal-wallis test and multiple comparison after Kruskal-w

Hello all, I used Kruskal Wallis test to compare three data groups pra testar comparações em três grupos (b,c,s). The p-valor was < 0,05 in all cases (So, there is difference among at least two groups ). So, I compared pair the paires of groups (to know how groups are different) and it...
15. Which analysis more suitable?

Dear all, My data consists of 8000 rows and 14 columns, as follows: The rows correspond to quadruplicate measurements of 2000 variables and columns represent different non time-related conditions. I want to identify variables with statistically significant size difference in any pairwise...
16. Controlling for type-1 error

We have conducted an experiment that asks respondents to rate whether they thought an article was biased on an 11-point scale, with 0 being biased to one side, 6, not biased at all and 11, biased against the other side. We used two organizations, each that supports different sides of the...
17. Alternatives to logistic regression when the number of cases is low

Hi All I got involved in my first foray into logistic regression, but have come to realize that I probably can't use it. Let me tell you about my data. I am investigating the consumption of 3 different insect pests by bats in an agricultural area. The response variable is binary for each...
18. Multiple comparisons correction help

Hi, I have already asked a similar question but did not explain my problem in entirety. Any help would be greatly appreciated! I am analyzing some data to which I think I need to make some kind of multiple comparisons correction. The data comes from an economic game (Dictator game) and is the...
19. Multiple comparisons of economic game data

Hi, Any help would be greatly appreciated! I am analyzing some data to which I think I need to make some kind of multiple comparisons correction. The data comes from an economic game (Dictator game) and is the form of donations made by subjects ranging from $0.00 to$ 0.50 (can be any \$ 0.01...
20. Simple effects- multiple comparisons adjustments necessary?

Hi guys, I cannot seem to figure out what the correct procedure is for simple effects analysis when decomposing interactions. So I have a significant interaction in a RM ANOVA- I decompose the interaction using simple effects in SPSS (by manipulating the syntax) and I find whats driving the...