Questions tagged [group-differences]
Group differences broadly refer to statistics which quantify the differences between two or more subpopulations.
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ANOVA with unreliable measure
I’m doing some literature review on sports science, in particular the effect of training on endurance.
There is no standard endurance tests. Some consist in intermittent contractions until exhaustion ...
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test for differences in empirical cumulative distribution functions between groups
What test could I use to test for differences in empirical cumulative distribution functions between two or more groups? Note that I am not looking for a test two compare two ecdf (Kolmogorov–Smirnov ...
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Measurement invariance across groups and time
I want to run a multi-group longitudinal model. Based on prior invariance testing, I can assume scalar invariance across groups and time. So is it appropriate to have both the same intercepts across ...
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How to find difference between two hazard ratios (ratio of hazard ratios)
I am reading a meta-analysis and in this paper the authors somehow compared HR from two groups with different treatments in each study. As I know, we can compare outcomes from two groups with ...
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What is the best t-test to compare two groups with a confounding factor and unequal sample size in each group?
I am working on my master thesis and came up with a problem. I want to validate if changing the raw material for a chemical reaction would give the same yield of my product of interest. First, I did ...
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Fitting multiple linear regression models to select molecules for which a feature of interest significantly alters concentration
I'm using data from a proteomics platform called Olink. In this case, the data comes from samples of 16 patients and 16 controls. The patients can be further classified into 2 subgroups. The assay ...
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How to properly compare a single diagnostic test in two subpopulations
Suppose I have a diagnostic test with a binary response. I have performed this test on some population.
Now, I split this population in two subgroups (e.g. male/female), and would like to check if ...
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gene total volume test
1, I want to compare the FGF gene total expression level (sum level from all the cells) in two groups of cells. Suppose group A has 500 cells and group B has 100 cells.
2, gene FGF level in the two ...
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Appropriate Research Design for Multiple Independent Variables and Dependent Variables
I need some advice on designing the quantitative aspect of my upcoming master's research project. My research design involves a convergent mixed methods study and aims to explore the factors that ...
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How to analyze between-group differences in within-group variances over time in a 3-level model?
The data I am using is collected within the physical fitness surveillance program in schools. In these schools, either no intervention, healthy lifestyle intervention, healthy schools network ...
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Standardization of summary statistic of group-linked values
Assume that you measure a summary statistic (e.g., arithmetic mean) in measurement windows of a fixed size along a long sequence of values and that these values are grouped into regions belonging to ...
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ANCOVA or MODERATION?
I'm struggling with the statistics for a question I'm collecting data to answer.
My paper is about whether different meditation types can increase happiness when controlling for meaning in life. There ...
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Group comparison with multiple group memberships
I want to statistically compare personality scores between different groups, but people can be in multiple groups. Is there anything problematic in just doing an ANOVA or a t-test since a respondent ...
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Transforming data with two groups for multiple regression analysis
I have a dataset includes 2 groups (HC, PT) and unfortunately, variables (8) are not normal. I'm trying to run a multiple regression to see if the relationship between the variable of interest ("...
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Variability of patients in different Hospitals
just to let you know that my statistical background is not very good. I made funnel graphs which shows the effect of polypharmacy against practice size.
In the funnel graphs, a dot presents a single ...
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