Normal Probabilty Plot

02022017, 04:32 PM
Post: #5




RE: Normal Probabilty Plot
If anyone wants to make a Normal Probability plot with a fit:
1. Put your sorted (lowest to highest) data into a column of the Statistics 2Var App. 2. Use the make function to fill another column with the formula: NORMALD_ICDF((X0.5)/N)) With X going from 1 to N (The number of data points) 3. Plot your data. 4. Hit the Fit button. Note: As Tim pointed out, there seem to be many ways to make this plot. I have also seen a slightly more complicated formula to generate the probabilities which comes from NIST's engineering statistics handbook: http://www.itl.nist.gov/div898/handbook/...rmprpl.htm To create this alternate form: Use the make facility to create NORMALD_ICDF((X0.3175)/(N+0.365)) from 1 to N. In the first row insert NORMALD_ICDF(10.5^(1/N)) In the last row put in NORMALD_ICDF(0.5^(1/N)) Proceed as above. 

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Messages In This Thread 
Normal Probabilty Plot  KeithB  02012017, 05:30 PM
RE: Normal Probabilty Plot  Tim Wessman  02012017, 05:53 PM
RE: Normal Probabilty Plot  KeithB  02012017, 07:41 PM
RE: Normal Probabilty Plot  grsbanks  02022017, 08:23 AM
RE: Normal Probabilty Plot  KeithB  02022017 04:32 PM
RE: Normal Probabilty Plot  mark4flies  02022017, 10:25 PM
RE: Normal Probabilty Plot  mark4flies  02022017, 10:29 PM

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