p value

  1. M

    Statistical test for app

    The tool I'm building will show two (or more images) to an audience of 100 people. The audience will select one of the options. For the customers of the tool, I want to be able to tell them something such as "Option A was chosen x% more than Option B. With 95% certainty, Option A is your better...
  2. Q

    Mann-Kendall interpretation. Working in R, "object 'y' not found"

    I am trying to run a Mann-Kendall over a group of files, to perform the MK on each one. This is precip data, for each area, over decades. I read the data into R, then create df "datalist". I bind all the files into one, and then split them by the name in the first column ("V1"). This all works...
  3. U

    How to calculate manually p value from F distribution with Degree of freedom 1 and 2?

    I want to calculate manually p value from F distribution with degree of freedom 1 and 2 (without any calculator or without any build in function). Example: degree of freedom v1: 1 degree of freedom v2: 28 F value: 242450.3519 we used FDist function in excel and got following result. (p value)...
  4. E

    Overlapping confidence intervals and p values

    Hi, I've been given the mean and 95% confidence interval (CI) of two independent groups and asked if they were satistically significantly different or not? I know that if the CIs of the two groups don't overlap at all, then they can be considered as significantly different. However if the CI do...
  5. S

    P values from bootstrap in R

    I've been trying to get the pvalue of my samples from a bootstrap rsquared test in R. I'm not very good with statistics so could someone please take a look at my below code and point me in the right direction with regards to how I can extract the p-values per sample (basically input a...
  6. S

    Extracting p value from bootstrap

    I've been trying to get the pvalue of my samples from a bootstrap rsquared test in R. I'm not very good with statistics so could someone please take a look at my below code and point me in the right direction with regards to how I can extract the p-values per sample (basically input a...
  7. S

    Getting p-value for rsquared bootstrap in R

    I've been trying to get the pvalue of my samples from a bootstrap rsquared test in R. I'm not very good with statistics so could someone please take a look at my below code and point me in the right direction with regards to how I can extract the p-values per sample? # Bootstrap 95% CI for...
  8. M

    Age-adjusted P value

    Hi, I have a table of baseline characteristics of a cohort in which I have compared the differences between those with kidney disease and those without, using a combination of Chi-square test, t-test, or Kruskall-Wallis test as appropriate. How do I age-adjust the P values that I get from these...
  9. K

    Hypothesis test for the difference of two means, should I consider annualized or monthly returns?

    I have 10 years monthly returns. I calculated annualized return multiplying the mean return over the period for 12. Then I calculated the excess returns as difference between the annualized mean return and the benchmark annualized mean return (no risk correction). Annualized standard deviations...
  10. A

    Interaction

    Hi, In your opinion is this a multiplicative qualitative or quantitative interaction?
  11. M

    How to test if gender impacts mortality rates when already considering age

    Hi, I am currently working on a research project where I'm analysing the impact of different factors on mortality. I have the past 10 years of data from a specific hospital and I have graphed the mortality curve by age separately for males and females. I can see that the one curve lies above...
  12. rogojel

    p-values in regression trees

    Hi, I am analyzing some pretty hopeless datasets where the link between the DVs and IVs is quite weak. I observed however that when I take the two groups resulting from the first partition in the tree I can generallly get a nicely low p-value with a t-test . Is this some property of the trees I...
  13. P

    Using pooled data formula or not?

    The question is: Broken arms can be treated with surgery or splints. In a study with 200 patients, half had surgery and half used splints. In the surgery group, 80 patients showed improvement after 2 months whilst 50 who used splints improved. Is surgery more effective than splints for...
  14. S

    Need Help With statistic work. Hypothesis testing

    Question 1 Below are the quarterly returns on investment (in £000s) of two different investment projects, which had the same initial outlay. There is a sample of 16 quarters of returns and your manager has asked you to investigate the relative performance of each project. In particular, your...
  15. L

    Confidence Intervals in a research paper

    Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal article in my own words, but I don't really understand what the researchers are saying. Here's the quote. Can someone please tell me basically what it...
  16. E

    MaxT corrected p value

    Hi all, I am trying to permute data and return a maxT p value to adjust for FWER. I have an example of data: SNP1 p value= 0.02 SNP1 permutation p values = 0.03, 0.03, 0.03, 0.04, 0.04. SNP2 p value =0.03 SNP2 permutation p values = 0.4,0.5,0.5,0.6,0.7 SNP3 p value = 0.3 SNP3 p...
  17. H

    P-Values equal to zero

    Hi, I am running simple OLS regressions on forward and spot price data and have been getting p-values equal to exactly 0 (i.e. not 0.0000000234) for either an x variable and or the intercept. I am not sure how to interpret these and if the interpretation is different between the x variable...
  18. R

    p value relationship to standard error as samples increase?

    Hi all, I would appreciate some help regarding the relationship between the p value and some other elements in my question below. Any help would be appreciated! I've spent about 4 hours researching this, and am still stumped.... How would you calculate the relative size of a p value given...
  19. S

    Help needed for upcoming exam: Chi square

    Okay...I have calculated my chi square with an answer of 8.33. No alpha is specified (so Im assuming it would be stated as 0.05). Degrees of freedom is 1 Question 1: How do I know what the p value is from this information question 2: what does 8.33 mean? does this correspond to a p value...
  20. S

    p-value and estimation of parameters with non linear least squares

    Hi I am performing an estimation of some parameters . I Have the next data: I am using nls.lm() function, and I am trying to fit this data to a logistic distribution. In order to realize this I have defined the next things in R. edad<-datos$Age u_x<-datos$mx...