Solved – the p-value for paired t-test if the two set of data are identical

As in the title, I have two sets of data that are identical. I performed a paired t-test using R. The p-value for the difference estimated (which is essentially 0) is NaN. I wonder if there can be a theoretical p-value for this case. Best Answer If the two sets of data are identical because … Read more

Solved – the p-value for paired t-test if the two set of data are identical

As in the title, I have two sets of data that are identical. I performed a paired t-test using R. The p-value for the difference estimated (which is essentially 0) is NaN. I wonder if there can be a theoretical p-value for this case. Best Answer If the two sets of data are identical because … Read more

Solved – Does it make sense for p-value to decrease with more data points

I'm running a multiple linear regression on a set of sports data. When I run the regression on one season, which has 380 data points and which I thought was a fair amount, I get quite a high p-value on one of my independent variables. However, when I run the regression on all my data … Read more

Solved – How to compute the probability associated with absurdly large Z-scores

Software packages for network motif detection can return enormously high Z-scores (the highest I've seen is 600,000+, but Z-scores of more than 100 are quite common). I plan to show that these Z-scores are bogus. Huge Z-scores correspond to extremely low associated probabilities. The values of the associated probabilities are given on e.g. the normal … Read more

Solved – How to compute the probability associated with absurdly large Z-scores

Software packages for network motif detection can return enormously high Z-scores (the highest I've seen is 600,000+, but Z-scores of more than 100 are quite common). I plan to show that these Z-scores are bogus. Huge Z-scores correspond to extremely low associated probabilities. The values of the associated probabilities are given on e.g. the normal … Read more

Solved – Different p-values for Chi squared and Fisher’s Exact R

I'm trying to find whether there's a correlation between two variables using Chi Square test and Fisher's Exact test. I get two different p values when I run Chi Square test and Fisher's Exact test. Which value should I take? Take Chi squared p value and do not reject H0 or take Fisher's Exact p … Read more

Solved – Different p-values for Chi squared and Fisher’s Exact R

I'm trying to find whether there's a correlation between two variables using Chi Square test and Fisher's Exact test. I get two different p values when I run Chi Square test and Fisher's Exact test. Which value should I take? Take Chi squared p value and do not reject H0 or take Fisher's Exact p … Read more

Solved – Understanding the significance of very small p-values

This question already has answers here: How should tiny \$p\$-values be reported? (and why does R put a minimum on 2.22e-16?) (4 answers) Closed 5 years ago. I have calculated p-values of two independent groups (each group contains 17 samples and each sample is 100 points). I used scipy's mann whitney u test. Further, I … Read more

Solved – Understanding the significance of very small p-values

This question already has answers here: How should tiny \$p\$-values be reported? (and why does R put a minimum on 2.22e-16?) (4 answers) Closed 5 years ago. I have calculated p-values of two independent groups (each group contains 17 samples and each sample is 100 points). I used scipy's mann whitney u test. Further, I … Read more

Solved – For what p-values can you say the data approached significance

I am in the field of clinical psychology, where statistical significance is commonly said compared to p = .05. For what values of p can I say data APPROACHED significance? Best Answer As already stated in comments: never. If you stick to Neyman-Pearson framework, then before doing your research you decide about some \$p\$-value threshold … Read more