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Questions tagged [significance]

231 questions
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Stata Correlation P-values for Multiply Imputed Data

I am running Pearson's correlations on multiply imputed data in Stata: mi query local M=10 scalar corr=0 mi xeq 1/`M' : correlate v1 v2 ; scalar corr = corr + atanh(r(rho)) scalar corr = tanh(corr/`M') di as txt "Correlation using Fisher's z over…
ksroogl
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power.prop.test function not interchangeable

I am using the power.prop.test function in R. I am doing an A/B Test where I am determining the lift from a minimum amount of impressions per group in order for the A/B Test to be significant. When I run the function like below, I get the second…
nak5120
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ggsignif: How to position significance sign over x-axis ticks

I want to have a box plot with the significance level (e.g. ***) over each group, without a line. The comparison to generate the p value/significance level will be for each test group relative to a single control group. I have a lot of different…
JamesCrook
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Significance level in hpgenselect procedure in SAS

I am building models with proc hpgenselect but I can't set significance level. In Docs I found out that parameter: ALPHA= Specifies a global significance level. However SAS still use default value of 0.05 building model (see on image below). I…
Roberto
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Python- How to do an f-test on 2D arrays?

The problem I have two arrays, we'll call them ar1 and ar2 (size (192,289)), that represent lat-lon maps of standard deviations, and I have an similarly-sized array of their difference. I want to plot the difference, and on top a stippling pattern…
Cebbie
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Why is my p value too low with > 1,000,000 obs (p<<0.01)

I know that generally a low P value is good since I want to reject the H0 hypothesis. But my problem is an odd one, and I would appreciate any help or insight you may give me. I work with huge data sets (n > 1,000,000), each representing data of one…
amann
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ANOVA over time in Python, what am I doing?

I really like statistics, but haven't taken a course in over 6 years. I'm having trouble figuring out what kind of test I need here, and the best numpy/scipy/R function to use for these kinds of issues. I've got a table of visitors and their…
linked
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Hotelling's T^2 test example using Mahalanobis distance to determine difference between groups

I'm am trying to follow the procedure described in this publication to determine whether separation between groups is statistically significant. The level of that publication is above my knowledge skyline, but I'm trying to approach it step by step.…
raumkundschafter
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Is it possible to test for significance using seaborn barplots in Python?

I have a pandas.DataFrame that looks like this: Group Replicate Time Normed 0 5ng/mLTGFb 1 1 0.924876 1 5ng/mLTGFb 1 2 0.891171 2 5ng/mLTGFb 1 3 0.928782 3 …
CiaranWelsh
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How to test if two lift values are significantly different from each other?

Consider this code: # Load libraries library(RCurl) library(TraMineR) library(PST) # Get data x <-…
histelheim
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Regression Options With Categorical X values

I am visualizing average biological parameters (i.e., weights, lengths, age, condition, etc.) over time (specifically across years) using geom_boxplot in ggplot. I have also fit a trend line through each data set using a linear model (specifically…
LNH
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significant test using scikit-learn's permutation test results in the same p-value for all classifiers

I'm trying to find out the significance of the results using scikit-learn's permutation test as in: score, permutation_scores, pvalue = permutation_test_score(clf.best_estimator_, X_train, Y_train, cv=10, n_jobs=10, n_permutations=100,…
Ash
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How to do R Vennerable Venn Diagram from Binary Matrices?

Inspection of the basic examples shows that the Vennerable input must a list of vectors here. So I do the following where I take there binary p-value matrices, and try to create a Venn diagram based on their common…
Léo Léopold Hertz 준영
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Forest plot interpretation

For my study I performed a meta-analysis of viral load measurements to test whether the specific interaction between A and B influences its levels. This is the forest plot I obtained using R: However, I don't know how to interpret it. I…
Svalf
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How to specify a significance test for multiple latent groups in Mplus

I have used a 3 step approach in MPLUS to first estimate a latent class model (LPA) and then used the most likely class (taking into account the misclassification) and put them in a growth model. I used a 5 class solution for the LPA. I would like…
Carl
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