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Questions tagged [statistical-test]

A statistical test provides a mechanism for making quantitative decisions about a process or processes.

Statistical Tests

A statistical test provides a mechanism for making quantitative decisions about a process or processes. The intent is to determine whether there is enough evidence to reject a conjecture or hypothesis about the process. The conjecture is called the null hypothesis. Not rejecting may be a good result if we want to continue to act as if we believe the null hypothesis is true. Or it may be a disappointing result, possibly indicating we may not yet have enough data to prove something by rejecting the null hypothesis.

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How to write the Kolmogorov-Smirnov in R

Long story short, I want to manually write the code for the Kolmogorov-Smirnov one-sample statistic instead of using ks.test() in R. From what I understand, the K-S test is basically a ratio between a numerator and a denominator. I am interested in…
Provisional.Modulation
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likelyhood ratio test r for logistic vs bilogistic distribution

i am trying to verify the better estimated distribution for my data between the bivariate GEV with logistic copulas and the bilogistic copulas. I operated by a likelyhood ration test and it shows only a good p.value when the the null hypothésis is…
user3603868
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scipy.stats.anderson test critical values

I used scipy.stats.anderson() to test for normal distribution. my test distribution was not normal distributed, therefore teststatistic > critical value. However, when checking all calculated critical values I observed, that for decreasing p-values…
user3276418
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Normal distribution with integer numbers

I'm running into some quite interesting problems over here. It is about creating a normal distribution with integer numbers in the range of 1 to 5 (1,2,3,4,5). Technically, it is a Poisson distribution with the shape of a normal distribution. My…
user2955439
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Checking for correlations when dataset contains numeric and categorical feats?

I've got a dataset with 50 features, so visualisation is out of the question. Aiming instead to get a list or table showing the pairs of variables that are correlated and which are statistically significant. Am I supposed to manually loop thorugh…
wick
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Performing Chi-Square test (or similar) across a spatial grid in R

I have a dataframe in R where each row is an sf-formatted geospatial polygon in the United States. I know the number of venomous snakes and the number of non-venomous snakes seen in each polygon. I also know the diets of birds in each polygon.…
Bradley Allf
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ANOVA in science social

I want to know if I can applied the test of ANOVA in my data: the items are scaled from 1 to 4, the Dimension is the sum of the items, the last variable is the region. I want to applied the test anova to see if there is an impact of region on the…
John
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How to perform Bonferroni test for multiple comparison after Two-way Anova?

I'm performing statistical analyses on gene expression data. My samples have two different conditions. The conditions are about the genotype and health of the plants. I have 4 different situations: Genotype1-Healthy, Genotype2-Healthy,…
Ottone Carmelo Viscardo
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Percent error violates anova normality assumption

I am looking for advice on what to do when percent error data (or just error rate) violates the assumption of normality for a 2x2 repeated measures ANOVA (N=51). I have already removed outliers, and that does not "help" the normality issue. I have…
john connor
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R: Apply function on each row with specific columns in loop

I created a loop to perform a statistical test on my dataset. The 2 samples I compare are certain columns of the same data frame. So I want to perform the test to each row and just save the p-value as a new column of the data frame. When performing…
Jimin
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What are the most simple and suitable statistical analysis to use on SPSS for objectives;

What are the most simple and suitable statistical analysis to use on SPSS for objectives; To investigate impact of COVID-19 on age, sex and gender where gender is nominal and age and sex are scales? To examine the health implementation of COVID-19.…
Fancy
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Should I take a sample before utilizing a statistical test from my dataset, when it is very large?

look I have this gigantic dataset and I want to check if there is any relationship between a numerical feature and my categorical target (2 groups). My numeric feature does not follow the normal distribution and I shoukld use a Non-Prametric test to…
Caio Sóter
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Difficulty in using Dunn Test in Python

I am trying to use the Friedman test to identify statistically significant proteins. For the sample data set, the values are medians (as multiple trials were conducted but have been summarized already). There are two separate media and a control for…
planckton
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Unabale to extract p-value from my betadisper, comes back NULL

I successfully ran my community data in R to make my NMDS figures and also successfully ran my statistical tests. However, when I try to extract my p-value from betadisper it comes back as NULL. Could someone please help me with this? I have…
Tal Schabes
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Should I use a t-test?

I am comparing two sets of samples that are of different sizes (n) and are from two different populations. Both sets have undergone a similar intervention at different time periods (one from August to December and the other from January to April).…
girl_in_data
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