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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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Encountering error while performing Johansen conintegration test

I am trying perform cointegration test on the following dataframe: col1 col2 col3 col4 col5 col6 col7 col8 col9 col10 col11 1736559 79 0 0 0 0 480 0.17 0.21 0.034 1 1930007 105 0 26 0 0 454 0.17 …
user6016731
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How can I implement, choose and rank the best continuous distribution based on given data?

I have done some research about finding the best continuous distribution based on given data and I have found several StackOverflow questions like the following: Fitting Empirical Distribution Finding Probability Distribution and Parameters for…
WDpad159
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cohen's D with contrasts in R

Can someone help me understand how to calculate cohen's D from an ANOVA with contrasts? I have no problem calculating cohen's D from vectors or datasets, but can't figure out how to do it from a contrast. Thanks. #Create data frame group =…
richiepop2
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Compare the Power between two statistical test in R

I need to compare the power between the Wilcoxon Test and Sign Test for Null Hypothesis: Theta=0 and Alternative Hypothesis: Theta>0. The data comes from a random normal distribution with n=20 and mu=0. I tried the following code to accomplish my…
Aragorn64
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How to construct such SEM framework with OpenMx or lavaan package in R

Hi well i am clinical scientist and relatively new to R and coding. While studying medical literature, I often come across the SEM frame work diagrams which explains multivariate regression or correlation just in one diagram which is interesting to…
Aryh
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how to select best fit continuous distribution from two Goodness-to-fit tests?

I looked into the question Best fit Distribution plots and found out that answers submitted were using the Kolmogorov-Smirnov Test to find the best fit distribution. I also found out that there is an Anderson-Darling test that is also used to get…
WDpad159
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A Problem with Family-wise Error Calculation

Consider I have a data set with a 12 variable and it contains about 100 cases. If I am going to do a t-test between two variables, then doing an ANOVA between 3 other variables then a post-hoc. and maybe after that a Mann-Whitney for non-parametric…
Hasan Jamil
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R - friedman_test - Error : not an unreplicated complete block design

I have a huge data-set of a thesis experiment that needed 15 days to collect. The Experiment is repeated 15 times. I wanted to run friedman_test to check whether my data was statistically different or not. I used the following code snipet Data <-…
Hadi Awad
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Getting KeyError while grouping my dataset into 2 samples

I am taking an online course. 'bikesharing_data' is the name of the pandas object and 'workingday' is the name of the column in that data frame. The tutor wants to divide the dataset into two samples and divides the 'workingday' into ([0, 1])…
Qasim Bin Mehmood
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R - test whether error term is homoescedastic and further related points

I normally program in VBA and studied business administration. But right now I have a task in R and am highly challenged on the following 3 points & would appreciate some help: Test whether the error term is homoscedastic. Test whether the…
DelveIntoEther
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Validating a US mailing address against an authoritative database

I have the following business requirements to authenticate a user on a web service using his / her supplied name and mailing address: Here are the requirements: Ask a user to supply his/her first and last name, Look up in an authoritative private…
Chris
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What statistical test should I use?

I have 2 groups data which I'm trying to compare. Neither are normally distributed. My dependant variable is weight in pounds. My independent variable is interaction with a mirror measured in number of visits to the mirror in a 10 minute period.…
Christy Judd
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How to apply K-S test for two discrete normalized probability distribution functions?

Imagine there is a spherical volume filled with black spheres of different sizes. In projection, there are some painted blue regions which are intersected by those spheres. The blue errorbars come from the probability distribution of the spheres…
Rebel
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Trouble Deciding How to Test for Variance in Bulk RNA sequencing Data

I have some bulk-RNA sequencing data that I need to do differential expression significance testing on. I have two conditions, WT and KO, with two replicates each, giving me a dataframe that looks like the following (the columns are in counts): …
montyman14
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T-test in R between Scores for Regions and Years

I'm currently trying to run (what I believe is) an independent samples t-test to determine whether there are significant differences between scores, however I'm a little new to R and am in the process of trying to figure out the…
Jace_Riley
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