How to enter prior information (Mean age and SD) into JASP for Bayesian two sample t-test

Comments

• Noah158

  September 26 edited September 26

  Hey! In JASP, you need to go to the "Input" section under the Bayesian test. There, where it says priors, you enter the mean and standard deviation for the malaria and dengue children. You input them as "informative priors". Be careful with your parameters! It's crucial. [url=https://projektowanie.art/]😉[/url]

  
  

  Noah
• drravikch

  September 26

  Thanks for the tip,

  I tried following the instructions.

  But in input section I find the following:

  

  I can only enter prior information of either malaria children or dengue children.

  How can I enter the two groups' prior age information: mean and Sd (location and scale are given for one entry)?
• drravikch

  September 26

  
  
• EJ

  September 26

  The prior information that is test-relevant is the expected effect size under H1. This is usually expressed as Cohen's d, that is, the difference in age divided by the standard deviation. You can certainly specify a prior based on previous research (an "empirical prior") but it needs to be on the scale of Cohen's d.

  EJ
• drravikch

  September 26

  Thank you.

  I try learning and doing it and seek further help if needed.

  Is there a comprehensive help file or user's manual of JASP that explains the components of input and output of Bayesian analysis for a clinician who is not a statistician?

  Thank you once again for the guidance.
• EJ

  September 26

  On https://jasp-stats.org/jasp-materials/ you will find Mark Goss-Sampson's manual Bayesian Inference in JASP. My website has several tutorial articles, and each year we organize a hybrid workshop on Bayesian hypothesis tests at the University of Amsterdam. I am about to start work on a course book but that project is likely to take a few years to finish.

  EJ
• drravikch

  September 26

  Thank you for the inputs for learning.