p value to z score

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Nuchto
Nuchto 2012-8-2
How do I determine the z score from a p value? Thanks!

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Star Strider
Star Strider 2012-8-3
编辑:Star Strider 2012-8-3
Using the ‘erfcinv’ function (part of core MATLAB) and writing it as an anonymous function:
z = @(p) -sqrt(2) * erfcinv(p*2);
where ‘p’ is the probability.
So:
zscore = z([0.025 0.5 0.975])
produces:
zscore =
-1.9600e+000 0.0000e+000 1.9600e+000
  12 个评论
Rik
Rik 2020-8-25
A bit late maybe, but I did end up putting it on the FEX, so here is the promised link: BlandAltmanPlot. Once Mathworks gets the example tab working again for github submission, you will even be able to see a nice doc.
Star Strider
Star Strider 2020-8-25
Rik —
Interesting function! Thanks for the citation!

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更多回答(1 个)

Oleg Komarov
Oleg Komarov 2012-8-3
编辑:Oleg Komarov 2012-8-3
Use icdf() from the Statistics Toolbox.
For (standard) normal:
icdf('normal',[0.005 0.995],0,1)
  2 个评论
Nuchto
Nuchto 2012-8-3
Mmm, could you put an example? How to compute z from p = 0.001?
Oleg Komarov
Oleg Komarov 2012-8-3
Which distribution?

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