# p-value

1. ### Partial Correlations with Missing Data

I have a dataset with incomplete/missing data and want to perform partial correlations in R. I realise that pcor.test does not allow missing data and partial.r does not show p-values of correlation coefficients. Is there any other command for partial correlations that a) allows missing data AND...
2. ### Calculations for one-sided confidence interval

Hello, I need help with understanding the result of µ*. Can someone show me the way to come to this result? Thank you in advance.
3. ### P value after Geisser-Greenhouse correction

I have noticed that when Graphpad Prism does a sphericity correction using the Geisser-Greenhouse correction, it halves the P value for this source of variation (typically Treatments). For example, in the example I am working on, it calculates an F value of 20.25, with DF(num) = 1.391, and...
4. ### Generalisation of 'overlapping confidence intervals'

I had a question about a common (possibly incorrect) trend in the medical field to look at whether two 95% confidence intervals overlap as a sign of statistical significance at the 95% level. I'm aware this is overly conservative. I've heard that 83% confidence intervals are 'better' but not...
5. ### Finding P-Values For a Null Hypothesis with Neutral Trend

Please help me. I am so lost. I have data that is days above a certain temperatures every year from 1948-2019. So basically something like: 1948 36 1949 31 1950 36 1951 34 1952 36 1953 35 and so on. To find the trend I already did a least-squares linear regression and go that done. Now I...
6. ### What does a p-value of 0 mean in excel?

Hi! I am in my first year of biomedical sciences and i currently am trying to write a paper about the difference in the incidence of a specific infectious disease between men and women. I am using an available dataset with the data about the incidence of the disease in a specific country. I...
7. ### P-Values for less than t test two sample differ by .002 when applying 1-[two-tailed-p-value] on a ti-83

TI83 - p-values for less than t test two sample differ by .002 when applying 1-[two-tailed-p-value] So I thought that a less than p value is equal to 1-[two-tailed-p-value] but on a TI83, I see that this is not the case. The reason I need to know is I am trying to make my own calculator using...
8. ### How to report linear regression results (Matlab)?

Hello, I performed a simple linear regression analysis in Matlab and am unsure about how to report the results. I definitely mention the coefficients and the p-value, but do I mention the t-statistics as well? And if so, how exactly? This is an example Matlab output:
9. ### Hypothesis testing

Hey guys, This is my first thread on this forum so please bare with me as I try to be as concise as possible, I'll then write down my questions at the end of the thread. I'm working on some class notes, and stumbled upon this problem that confuses me on some point: "The drying time of a...
10. ### Difference between Mann-Kendall and Pearsons Correlation to obtain p-value

Hi, I am carrying out an analysis about Vegetation and Time. I did a simple linear regression and I got the correlation between both variables (Pearsons). Now, I would like to get the significance of the data. I got the significance (p-value) carrying out "Pearsons Correlation" but my question...
11. ### My data does not follow a normal distribution, but Mann Whitney U test gives me a p-value of 0.935?

As the question indicates, I conducted a normality test on Minitab, and the p-value I received was 0.018, which is less than the significance level, therefore, it is not normally distributed. Therefore, I had to conduct a non-parametric Mann Whitney U test, and the p-value is 0.935, which...
12. ### AMOS - interpretation of bootstrap indirect effects for one-tailed hypothesis

Hello all, I'm testing for mediation using bootstrapping in AMOS. This method reports results for two-tailed significance, but my hypotheses are directional. With bootstrapping, significance is assessed based on confidence intervals - though a p-value is also provided. For regression, I would...
13. ### P-value - Parametric Vs Non-parametric

Greetings Is it possible to compare the p-values derived from non-parametric tests to parametric tests? For example, lets say dataset 1: Copper concentration in spoil is not normally distributed, so I have to use a non-parametric test on it and get a p-value. Dataset 2: copper concentration...
14. ### Statistical significance

Hi, I have the following problem and I would need some piece of advice to solve it: I have a group of 28 patients (17 survived, 11 died) and I am trying to find out if some of quantities are capable of discriminating survivors from non-survivors with a ROC analysis. For all the considered...
15. ### Question regarding RM ANOVA

Dear readers, I have a question regarding my output from the repeated measures ANOVA. For my paper I have hypothesized that Dutch, masculine voices in men were more attractive than foreign, masculine voices in men for a short-term relationship. My results from the three-way RM ANOVA were...
16. ### Question regarding Repeated measures 3-way ANOVA for thesis

Dear Readers, I am new to this forum and I have a question regarding my output/researchdata. I am currently analyzing my hypothesis with respect to masculinity preference for voices (masculinized voice/feminized voice) and mating strategy (short-term/long-term). My hypotheses is that(a)...
17. ### SPSS Complex Samples Logistic Regression

Hi all, I am hoping this is a simple question... I am using SPSS for complex samples and in my logistic regression output I do not have any p-values for the significance of my variables. Does anyone know where I can get the p-values in my output of logistic regression of complex...
18. ### Estimating probability of critical value

Hello everyone, Once we get a critical value (for example 4.5) how can we estimate the probability of having a value higher than 4.5 if the probability distribution is not normally distributed? I leave in attachment a picture of the histogram that I get. Thank you very much for all the...
19. ### SigmaPlot 12.5 - Kruskal-Wallis followed by Dunn's post hoc - how do I get p-value?

Hello, I've been using SigmaPlot12.5 to run nonparametric Kruskal Wallis test, followed by Dunn's post hoc. When I get the read out for "All pairwise comparisons," the results only tell me if the P-value is less than or greater than 0.05. Is there a way to have the program provide the specific...
20. ### p-value NaN on ANOVA

Hi All, I am using an online 1 way ANOVA calculator for a medical stats (I am a novice!) but I end up with a p-value that is not a number (NaN). I have 3 samples... If anyone could kindly shed some light it would be much appreciated! I can provide the raw data if necessary. Many thanks...