Questions tagged [parametric]
The parametric tag has no usage guidance.
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Power calculation for two populations of equal variance
If I had a scientific assay which when run on a control population produces readouts which are normally distributed about the mean. A treatment which changes this mean does not change the variance of ...
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Independent Sample T-test or Mann-Whitney U test?
I am a very young stats learner, and I need help understanding the justification of a test choice. I have a sample of 39 participants (20 females and 19 males) been measured on task performance, and I ...
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Example of a parametric family of distributions that always has dependence on among its variables
Inspired by this question, I would like an example of a parametric family of distributions such that there is dependence for all choices of parameters. The family could be infinite or finite, but I ...
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Are there any parametric machine learnig models that can represent non-linear behaviour between a predictor and a targe variable?
Some basic models, like multiple linear regression (MLR), are parametric but usually limited to linear interactions between X and y. Other models can represent non-linear interactions between X and y, ...
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Why are parametric tests more powerful than non-parametric tests?
I'd like to understand why parametric tests are more powerful than their non-parametric alternatives. Is the word choice of "power" the same as statistical power? As I understand it, power ...
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Which test should I use to compare a normal distribution sample with skewed distribution sample?
I have two groups : Infection group (n=26) and healthy control group (n=127).
The aim is to see if there is a difference in the mean of T cells absolute count* values between the two groups.
Ho= the ...
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Survey sampling: How many participants per group (current, former, and potential users) should we recruit?
We are designing research in which we will explore the perception of users (C current, F former, and P potential) on a product. We apply the same questionnaire for each group adapting (verb tenses) ...
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What repeated measures statistical tests should I use with uneven sample size and parametrical/nonparametrical distribution?
I'm looking for a way to measure significance + variance homogeneity/heterogenity
First of all I tested my data for normality and it's not always parametrical, so I think that I should use different ...
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When is a hypothesis test appropriate? [closed]
For example, when would a hypothesis test bed used?
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Data didn't pass normality testing for K-W and S-W but the skew and kurtosis were within range...advice please?
I am conducting a study on the relationship between rural/urban living, intentions and barriers to help seeking in adult males. I was planning to conduct a correlation and then pending that result, a ...
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Bias due to delayed entry?
Imagine I want to study career longevity of scientists. I define a career based on publication records. So a (publishing) career starts with the year of first publication and ends in the year of the ...
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When do we have nuisance parameters?
From Wikipedia:
a nuisance parameter is any parameter which is not of immediate interest but which must be accounted for in the analysis of those parameters which are of interest.
Suppose originally ...
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