Questions tagged [parametric]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
10 views

Can I use parametric statistic tests if data are normally distributed in each group, but not overall?

I have a control group defined by a certain variable (say values 0-5) and an sick group (values between say 5-20). Within each group the data are normally distributed, but (off course) not when ...
1
vote
1answer
31 views

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 ...
1
vote
1answer
52 views

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) ...
0
votes
0answers
34 views

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 ...
1
vote
1answer
43 views

When is a hypothesis test appropriate?

For example, when would a hypothesis test bed used?
0
votes
0answers
17 views

Should I use a parametric test or non-parametric test?

I'm analysing a set of data on the fluorescence intensity of a particular receptor. All the data are in the form of a fraction as they are being compared to a control. ie. fraction = intensity of test ...
0
votes
0answers
18 views

Differences between parametric and non-parametric models

Aside from the number of parameters and their behavior with the sample size, are there any other significant differences between parametric and non-parametric models? Is there any situation where we ...
1
vote
1answer
33 views

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 ...
0
votes
1answer
56 views

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 ...
0
votes
0answers
10 views

Regression and classification as parametric family estimation

I am trying to understand whether the following reasoning has any flaws: Suppose I have a regression or classification problem. Let's stick with regression for the sake of example. I want to model the ...