Questions tagged [statistical-test]

a mechanism for making quantitative decisions about a process or processes.

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Which statistical test do I use?

I am running a study but am unsure which analysis to run. My study involves changing attitudes where participants will be given a questionnaire (on a scale of 1= strongly disagree, 5= strongly agree, ...
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Pick Top 3 - Cochran's Q?

I am trying to determine which statistical test to use. Participants were asked to choose the top 3 most important statements from a set of 15. I have read that Cochran's Q can be used to compare ...
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What statistical test is appropriate? [closed]

I'm running a study that is looking at whether exposure to different conditions can change views. Participants are completing a questionnaire on their views (strongly agree, agree etc.) being exposed ...
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Two tests for the same question

We have two series of scores (continuous variables) obtained for two groups of students formed randomly from a population for which we ask ourselves whether an intervention (a teaching method for ...
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Choose proper test for two numerical vectors in different length

I am currently struggling to find the most proper test to serve my needs. The thing is, I have one data matrix. The columns are computational features and each row corresponds to a patient. The last ...
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67 views

Chi-squared test, Poisson distribution, type I error overestimated - well-suited test for discrete distributions?

UPDATE I edited my original question to make it as clear as possible. My goal is to find a reliable goodness-of-fit test for Poisson-distributed samples. There are a few discussions here related to ...
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Advice on how to answer the “how large of a sample size do we need to show results” question to non-quant people in a business setting

Not sure if this question is too vague, but I'll give it a shot. I've received many questions from non-quantitative colleagues along the lines of "what sample size do we need to trust these ...
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4answers
273 views

How to generate random numbers normally distributed in R or any software with limitations (bounds)?

I am working on a project where I need to generate random numbers for a given task time which is normally distributed with mean = 40, and standard deviation = 150. Because of the high SD, I will get ...
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Why does the value of a conversion rate change the number of observations required when calculating statistical power?

This is probably basic, but I haven't come across it before: With a minimum detectable effect of 10% and a baseline conversion rate of 0.44% it takes 265,857 observations per cohort to reach 80% power ...
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Comparing the relative importance of predictors between two data sets [closed]

I am working on a project in which I am comparing the the ability of a series of predictors to explain variance in an outcome. Because the predictors are all indicators of the same construct (and are ...
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How to test whether different observers are getting the same count result for different species?

I have a set of data with over ten 'observers' and over ten 'species'. The below image is an example of how the data is set out in the table, although I also have it in a three column format of '...
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Working with Discrete-Time Survival Analysis with Random Factors in R

I'm working with some data on artificial (fake) bird nests, looking into their 'survival' from animal attacks. I visited the nests once every two days, for 2 weeks (so my time points are 2,4,8,10,12,...
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Which statistical test for “number of cases” with multiple, different group?

I need your help to identify which statistical test I choose for my data. I am analyzing if the "year of experience" of the nurse at the Triage, may influence the correct assignation of the &...
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61 views

How to choose a good test statistic to use in R

I find it hard to understand how to use statistical tests in R. I must use the most compatible statistical test to test if there is a significant difference between the means of 2 samples. I have 2 ...
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How to explain to a non-statistician researcher why the 2-sample Hodges-Lehmann-estimator is reported instead of the difference in median?

I need to explain the result of the wilcox.test in R. Many people believe it's about medians. Of course it is not. I understand this is a useful non-parametric measure about statistical equality of ...
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What is an intuitive way for choosing the right Statistical test?

In my Statistics class, we just talked about Statistical tests. So far I’ve been understanding the material, okay, but now I’m very confused. I get that Statistical tests are used in hypothesis ...