Question

excel p value

Asked by: dddw

I have read some of the prior questions on if Excel can calculate the p-value such as in the below example:

1100      3000
500      990

Currently I use MINITAB to do all the statistical testing to figure out if there is significance at the .05 or .10 level.

MINITAB example:

Test and CI for Two Proportions

Sample     X     N  Sample p
1       1100  3000  0.366667
2        500   990  0.505051


Difference = p (1) - p (2)
Estimate for difference:  -0.138384
95% CI for difference:  (-0.173983, -0.102784)
Test for difference = 0 (vs not = 0):  Z = -7.62  P-Value = 0.000

Fisher's exact test: P-Value = 0.000


Is there a way to calculate the p value in Excel with a formula?

Thanks!

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Asked On
2009-08-03 at 11:34:21ID24622410
Topic

Microsoft Excel Spreadsheet Software

Participating Experts
1
Points
500
Comments
10

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Answers

 

by: NULL_ReferenceExceptionPosted on 2009-08-03 at 11:41:32ID: 25007174

You can use TDist for this

 

by: NULL_ReferenceExceptionPosted on 2009-08-03 at 11:41:47ID: 25007175

 

by: dddwPosted on 2009-08-03 at 11:54:32ID: 25007315

I am not familar with TDist.  I can not figure it out from the link you suggested.  Can you help me out with this example in the attached spreadsheet?  I am looking for the p-value of a test for 2 proportions.

Thank you.

 

by: NULL_ReferenceExceptionPosted on 2009-08-03 at 12:13:35ID: 25007556

I'm not sure what your data represents, but the formula is:

= TDIST(ABS(tstat),df,#tails)

Where tstat = the t-statistic being calculated
df = degrees of freedon
#tails I assume for you would be 2

Heres a good page with Excel statistical functions:

http://www.comfsm.fm/~dleeling/statistics/excel.html

 

by: NULL_ReferenceExceptionPosted on 2009-08-06 at 05:12:04ID: 25032304

How did you make out with this?

 

by: dddwPosted on 2009-08-06 at 10:09:35ID: 25035702

Not good.  I still can't figure it out and have not had much time to work on it.  I will let you know if I have more questions.


Thanks.

 

by: NULL_ReferenceExceptionPosted on 2009-08-06 at 11:51:40ID: 25036771

What are you using for the degrees of freedom?  Is this a 2 tail distribution?  

 

by: dddwPosted on 2009-08-06 at 12:10:05ID: 25036984

I appreciate your patients.  Stats are not my expertise.  

In this case, it would be two trails but I don't know what the degrees of freedom is.  Please see the attach Excel file.  I can run a test of 2 proportions in MINITAB to find out the p-value but would like to just do this in Excel to cut down on repetitive copy/pasting from Excel to Minitab.  In the attached file, I pasted the MINITAB results.

If you can help me out, that would be great.


Thanks.

 

by: NULL_ReferenceExceptionPosted on 2009-08-08 at 12:12:23ID: 25051297

 

by: dddwPosted on 2009-08-10 at 07:17:34ID: 31613726

Thanks for trying to help on this question.  I do not completely understand how to apply the solution to my specific issue but that is because of my lack of understanding of p-value statistics.  The answers given have helped me understand p-value calculations and it is good to know that Excel can do p-values.

Thanks.

20120131-EE-VQP-002

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