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Questions tagged [hypothesis-test]

Functions used to choose between competing hypotheses about one or more probability distributions. For statistical questions, please use stats.stackexchange.com.

Common hypothesis tests include the one-sample and paired t-test for means, the z-test, which approximates the t-test for large samples, F-test for differences in variance, and Chi-square test for independence, and Fisher's exact test for differences in proportion.

Please note that this tag is totally different from , which refers to software testing.

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compare sample data and generated data

We have sample data, we managed to determine the distribution type that it follows (Generalized Extreme Value) and its parameters (K,Sigma,Mu) And we generated n samples (10000) from the same distribution with the same parameters and in the same…
user3332603
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Doing large number of 2-sample proportion tests in r

I'm trying to create a simulation for a proportion test to see how often I would get a significant results (i.e. p/value < 0.05). I'm assuming unequal population sizes, so for example test <- rbinom(100, 5000, 0.05) ctrl <- rbinom(100, 10000,…
L Xandor
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hypothesis testing with bootstrap confidence intervals

I'm trying to do some hypothesis testing with a bootstrap confidence interval, but am having some trouble setting up the bootstrap. The goal is to test the null at theta=1 and at level 0.05. I've provided a sample of the data that is being used…
Jay
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how to fix leaks with instruments in iOS app

I have just started with instruments to find for memory leaks in app Can any one suggest me how to fix the leaks as mentioned in instruments.. Actually I am getting as shown below screen Can any one suggest me the steps to fix.. I have referred…
soumya
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Kolmogorov-Smirnov test using L-moments instead of mle estimates in R

I am trying to perform a KS test to assess the suitability of fitting a Pearson III distribution to my data. Using mle implemented in fitdist from the fitdistrplus package we obtain parameter estimates which can be directly plugged into…
boro141
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Test if regression weights are different from 1

I am doing an lm()regression with R where I use stock quotations. I used exponential weights for the regression : the older the data, the less weight. My weights formula is like this : alpha^(seq(685,1,by=-1))) (the data length is 685), and to find…
etienne
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Hypothetical Testing in Kolmogorov-Smirnov Test- Whether critical value or p value

I am new to Statistics. I am trying out one sample Kolmogorov-Smirnov Test. I was able to find till D max. But I am confused to move forward for Hypothesis Testing. Inorder to determine the Hypothesis should I move forward with -- Critical value…
USB
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Paired t-test in R

I am trying to run a paired t-test in R on data grouped by factors: > head(i.o.diff,n=20) # Difference Tree.ID Tree.Name Ins Outs #1 0.20 AK-1 Akun 1.20 1.0 #2 -1.60 AK-2 Akun 0.40 2.0 #3 -0.60 AK-3 …
elduderino260
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Apply t-test on list in R

I have a list object in R with dataframe names as: "pav_DJF_histo.csv" "pav_DJF_rcp26_2040s.csv" "pav_DJF_rcp26_2080s.csv" "pav_DJF_rcp45_2040s.csv""pav_DJF_rcp45_2080s.csv" "pav_DJF_rcp85_2040s.csv" "pav_DJF_rcp85_2080s.csv"…
code123
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T test and permutation testing

I have a data frame which looks like this. There are 2 separate groups and 5 different variables. df <- read.table(text="Group var1 var2 var3 var4 var5 1 3 5 7 3 7 1 3 7 5 9 6 1 5 2 …
user2846211
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Research paper for paired t-test implemented in R

I have used paired t-test to validate the hypothesis using my data from R. Is there any research article related to t-test in R? If there is any article related to t-test in R, please let me know.
Exchhattu
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Error with t-test

I'm having errors with the normal t-test: data <- read.table("/Users/vdas/Documents/RNA-Seq_Smaples_Udine_08032013/GBM_29052013/UD_RP_25072013/filteredFPKM_matrix.txt",sep="",header=TRUE,stringsAsFactors=FALSE) PGT <-…
ivivek_ngs
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T-test in Compare of evolutionary Algorithms

I have implemented 2 evolutionary Algorithm. and run each of them for 100 trials. I have saved the final best fitness values of each trial. How can I use T-Test to compare final mean fitness of each algorithm with matlab? I want to see whether a…
aeranginkaman
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How can I run a Mann-Whitney test with a variable with three values?

I have a dataset in Stata with two variables, perc_vol (numeric) and low_medium_high (values "L", "M", "H"). I want to run a Mann-Whitney test to compare perc_vol between H and L, H and M and L and M. For two values I can use code like ranksum…
Marcel
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T.Test in Excel vs. Python

I am checking if Set A is better than Set B. Excel says it is at 95%. Excel I am using =T.TEST(Set A, Set B, 1, 1), p-value = 0.019914 Python, this code gives me , p = 0.90 or not significant based on the function below. What is correct? #…
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