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how to convert p value of <.0001 to actual number

jaboraws

Is it possible to get an actual number for pvalues instead of "<.0001"?

Accepted answers

In report table boxes, double-click on a p-value (or any number col box) to bring up the number format window. Change the setting from "PValue" to "Best".

martindemel

The reason why you see 0e+0 is most likely that the number of leading zeros after the decimal is higher than what you asked to display. Then JMP or any other software can only represent what is given by the calculations which is 0 then.

However, you should be aware of floating point arithmetic and what it is capable of calculating.1e-17 usually is the point where a floating point number cannot differentiate from 0, which means every non-zero value smaller than 1e-17 will be interpreted in calcualtions as zeros. That's (within others) for what symbolic math is good for, because you use symbolic values to deal with that, and the maths behind will calculate further on with mathematical rules rather than actual numeric calculations. Just a side note

All comments

In report table boxes, double-click on a p-value (or any number col box) to bring up the number format window. Change the setting from "PValue" to "Best".

jaboraws

Thanks but I have already tried that and the "<.0001" values just get converted to "0".

ron_horne

try changing it to fixed Dec as follows:

jaboraws

Thanks but I also tried that, even maxing out the width and decimal places and still converts is to simply "0" or "0.00000..........".

Try to edit the width of the number. But maybe there is a limit for how small numbers JMP will show.

Here's a really small p-value from an ANOVA (I use JMP 12.2).

Prob > F

4,3e-179

jaboraws

Thanks again, I tried that as well and it still just converts it to "0". Actually the p value you got is exactly what I want as well. Not sure why I cannot convert it like you. I also am using JMP12.2.

Example:

Steven_Moore

jaboraws,

JMP uses a value called Log Worth in the Partition platform to convert very small p-values into useable numbers. You might want to look at that.

The Log Wroth is the -log10(p-value).

Hope this helps.

martindemel

Hi MS, could you provide the example for this ANOVA value, I'm just curious how much I can force JMP to show those values Thanks!

jaboraws

This is exactly what I am trying to do. I performed a Fit Y by X and then performed a Dunn's test to compare the means of my samples versus my control group and got a list of p values (which I ultimately want to convert to -log10(pvalues)).

The problem is the list of p values contains many "<.0001" values which are not usable for calculating the log worth. I am trying to look into the log worth calculation in the partition but not having much luck yet.,

Thank you for the information.,

martindemel

Question, can you share the data privately, so I could take an explicit look on it? Guess it is at least too confidential to share it here, but if you want me to try to replicate what you experience, I'm happy to take a look.

just email to martin.demel@jmp.com

... and the steps you did

rlw268

Did you ever find an answer for this? I am using logistic regression one of my x variables has a p-value of 0.00001 and logworth 56.125, and the other has a p-value of 0.00219 and logworh of 2.something. I know JMP is taking the negative log of the p value but that does not work for p-values of 0. I am lost?

Mark_Bailey

You can double-click the p-value, change the format to Best, and change the Width so that you can see the whole number, for example, Width = 15.