All Questions
Tagged with nonparametric t-test
96
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Using paired t-test or Sign test to compare two groups of correlated measures on the same subject?
I have conducted a survey where participants are shown 8 different advertisements: 4 of the ads attempt to evoke the feeling of guilt, 4 others attempt to evoke the feeling of shame. After seeing each ...
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What statistical test is good for two groups of yes/no data set?
I have to detect certain bacteria and used two methods for same 200 samples. I have tabulated two methods as below:
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- 101
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132
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What test to use when the dependent variable is an integer but independent variable is categorical? (Data non-normal, unequal variances)
My independent variable is species (categorical).
My dependent variable is the total mass of what each species ate (in grams, numerical).
I want to test the difference in mass values between ...
- 145
1
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54
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SPSS Chi square of one sample test
I am trying to analyze the following data: participants chose over 18 trials whether they would like option 1 or option 2. Option 1 is recoded as 0, option 2 is recoded as 1. Now if I count all ...
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216
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Variance in a T-test using means/medians
I have turning data for animals in different conditions with comparisons of before and after these conditions, we'll say condA condB.
Each animal has 3 repeats on both conditions, where before a ...
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371
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Interpreting a significant correlation in a small sample
I found a correlation between two variables:
Variable A is dichotomous, with values 1 and 2 (for yes/no)
Variable B is continous (score, 0 - 50)
They correlated with each other. However, my sample ...
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71
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How to calculate a 𝑝-value for the difference between two non normal distributions of counts?
I have two NON normal distributions (a and b), they are also different lengths
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57
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Do we need parametric tests? [duplicate]
First of all, sorry for catchy title, my question is not that broad as it suggests.
I just came to conclusion that I don't need parametric tests. Instead, I need some feedback if my reasoning makes ...
- 4,091
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36
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2 sample t test
I was thinking that a simple 2 sample t test is not that simple when dealing with skewed data.
Considere 2 samples, each one with diferent skewness and kurtosis, both with a big sample sizes (say n > ...
- 561
1
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2
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696
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Under what circumstances does Mann-Whitney and Wilcoxon signed-rank test fail?
I read from here that
The advice must be modified somewhat when the distributions are both strongly skewed and very discrete, such as Likert scale items where most of the observations are in one of ...
- 1,041
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553
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Significance test with non-normal, bounded data?
I am attempting to do a one-sample significance test to determine whether a set of data differs from a given value (0 in this case). The issues I have with these data:
Non-normally distributed data, ...
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Papers About Permutation Version of Welch's t-test
Permutation tests seem to provide a promising alternative for the unpaired t-test, requiring fewer assumptions. However, the core assumption of the permutation test, exchangeability, implies ...
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404
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Appropriate statistical test for data which do not have normally distribution and do not have equal variance
My data has 150 samples and is not normally distributed, and it does not have equal variances either. I know t-test (e.g. this python method) can be used when data is normally distributed and it can ...
- 271
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Alternative test to paired t-test? [duplicate]
I need to compare data from paired groups, but my distributions are non-normal, and my sample size is small. Are there any tests I could apply?
I've been looking into non-parametric alternatives like ...
- 11
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2
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122
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Which statistic test should I use in this situation?
There are 10 questions in which we are comparing peoples' opinion about two conditions, "X"and "Y". Every question was answered by about 90 people who were different than other questions' respondents. ...
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