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Could you clear up some notation for me? What does P(D) mean? I read that is, the probability of Data being true. edit: to clear up my meaning. I mean, it m
by GhotiFish 12y ago
Could you clear up some notation for me?
What does P(D) mean?
I read that is, the probability of Data being true.
edit: to clear up my meaning.
I mean, it makes sense to me to ask "What is the probability of getting this data, given that the null hypothesis is true"
and "what is the probability of the null hypothesis being true, given this data"
but I don't know how "this data" evaluates on its own. I can't picture that
does it mean, how authoritative is the data? Maybe that's it.
edit: OK never mind I kinda worked it out on my own.
- yummyfajitas 12y agoP(D) is the probability of observing the data you just saw, due to either the null or non-null hypothesis. It's a strictly Bayesian quantity, since it's dependent on a prior. If your model has only a null and alternative hypothesis, then: P(D) = P(D|H0)P(H0) + P(D|H1)P(H1)