# Non-Normal Data Analysis Literature, Websites, Books for Learning

K

#### krichmond0306

This is a call for help, what literature, websites, books, etc is available for how to work with non-normal data?

#### Steve Prevette

##### Deming Disciple
Staff member
Super Moderator
From my Master's Degree work, I'd recommend:

Olkin Glesser and Derman, Probability Models and Applications covers much about distribution fitting and many available distributions.

Acheson Duncan's Quality Control and Industrial Statistics is also good.

But from a practical nature, I'd suggest looking at "non-parametric" analyses. It would also help to know the context of why you are asking the question - in order to apply non-normal distributions to what?

B

#### Barbara B

Are you searching for methods which can deal with data which isn't normal and you know why it isn't normal, but want to use methods which require normality
or
are you searching for methods which could tell you why your data isn't normal?

If you're looking at process data this usually won't be normally distributed, because changing of settings in the process will change the outcome and in most processes changes are not only permitted but usual and requested (e.g. adjustments due to tool wearing). A normal distribution will only directly occur within your process data if the process outcome simply reflects random variation and no "special causes" (systematic changes, sometimes rare events).

Ppk results shown as asterisk after the transformation of Non-normal data Using Minitab Software 4
L How to evaluate the process capability of a data set that is non-normal (cannot be transformed and does not fit any known distribution)? Capability, Accuracy and Stability - Processes, Machines, etc. 12
R Non Normal Data in a historically normal process Capability, Accuracy and Stability - Processes, Machines, etc. 6
Y Process Capability for Non-Normal Data - Philosophical Questions Capability, Accuracy and Stability - Processes, Machines, etc. 6
P Non-normal Data Cpk Statistical Analysis Tools, Techniques and SPC 5
S Non-Normal Data - Measurement for "straightness" with a 0.001" max tolerance Capability, Accuracy and Stability - Processes, Machines, etc. 10
D Calculating Cpk on Non-Normal Data Distribution Capability, Accuracy and Stability - Processes, Machines, etc. 10
J Non-Normal Distribution Data - Tolerance Intervals and Minitab Using Minitab Software 7
M t-test with Non Normal Data Statistical Analysis Tools, Techniques and SPC 16
R Transforming or not Transforming - Dealing with Non-Normal Data Statistical Analysis Tools, Techniques and SPC 10
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M Non-Normal Data & Minitab Statistical Analysis Tools, Techniques and SPC 17
M Non Normal Data Managing - Clements Method to get Process Characteristics Statistical Analysis Tools, Techniques and SPC 8
M How to Do Ppk on Non-Normal Data Capability, Accuracy and Stability - Processes, Machines, etc. 10
T Non-normal data for Cp Cpk indices Statistical Analysis Tools, Techniques and SPC 1
U Calculate Z-Score for Non-Normal Data - I have two set of data Statistical Analysis Tools, Techniques and SPC 9
S Capability Analysis of Non-Normal Data Statistical Analysis Tools, Techniques and SPC 23
T Cp and Cpk calculation for Non-normal data? Statistical Analysis Tools, Techniques and SPC 11
T Capability with Non-Normal Data - Component Strength Statistical Analysis Tools, Techniques and SPC 11
Y Perform 2 ways ANOVA in minitab with non normal data involved Using Minitab Software 5
B How to identify whether my data is non-normal? Statistical Analysis Tools, Techniques and SPC 26
Quality control with non-normal, censored and truncated data examples needed Statistical Analysis Tools, Techniques and SPC 0
Use of Non-Parametric Statistics and Non-Normal Data Statistical Analysis Tools, Techniques and SPC 33
N Analysis of non-normal stratified data for cpk/ppk? Rupture test Capability, Accuracy and Stability - Processes, Machines, etc. 6
R P-value is 0.05 - Normal or non-normal data? Capability, Accuracy and Stability - Processes, Machines, etc. 31
L How to calculate tolerance intervals for non-normal data? Reliability Analysis - Predictions, Testing and Standards 13
J Is a t-test used in non-normal data analysis? Six Sigma 7
C Analyzing Data with a Non-Normal distribution Statistical Analysis Tools, Techniques and SPC 41
A Capability Analysis - Dealing with non-normal data in Minitab Using Minitab Software 8
V MINITAB and non-normal unilateral tolerance data - Cannot confirm Ppk values Using Minitab Software 15
J Non-Normal Data - Transforming the Data to Normal Statistical Analysis Tools, Techniques and SPC 12
R Bootstraping and Resampling Statistics - Capability for non-normal variable data Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
A Non-normal Distributions in SPC - How do I Normalize Data? Statistical Analysis Tools, Techniques and SPC 55
Apply control limits to a non-normal distribution Statistical Analysis Tools, Techniques and SPC 13
Non-normal Distribution Selection where the system is constantly being corrected Capability, Accuracy and Stability - Processes, Machines, etc. 11
Process Capability for parameters with non-normal distribution. Capability, Accuracy and Stability - Processes, Machines, etc. 16
M Is it possible to get Natural Tolerance (Tn) with Non Normal Distribution? Statistical Analysis Tools, Techniques and SPC 9
Test of Means or Medians for Non Normal Populations? Using Minitab Software 6
S Which Normality Test more acceptable to FDA; Also, Non-Normal Threshold? Qualification and Validation (including 21 CFR Part 11) 5
S How you define 'Normal & Abnormal' Conditions and 'Routine & Non-routine' Activities ISO 14001:2015 Specific Discussions 8
A Finding Control Limits for a Non-Normal Distribution Statistical Analysis Tools, Techniques and SPC 3
R Torque Confidence Testing (Non-normal Distribution) Statistical Analysis Tools, Techniques and SPC 5
F Non-Normal Distribution vs. Gamma Distribution Statistical Analysis Tools, Techniques and SPC 18
F Process Capability for Non-Normal Process Statistical Analysis Tools, Techniques and SPC 5
C Designing control chart for non-normal variables Statistical Analysis Tools, Techniques and SPC 3
M Cp, Cpk, Dpm, or other? Diameter of a Hole - Non-Normal Distribution Capability, Accuracy and Stability - Processes, Machines, etc. 20
A ANSI Z1.4 or Z1.9 for non-normal distributions? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
D Ppk of non-normal bounded proccess, one sided specification Capability, Accuracy and Stability - Processes, Machines, etc. 3
J Capability of Inherently Non-Normal Process - Plating Process Thickness Distribution Statistical Analysis Tools, Techniques and SPC 9
D Control charts for non-normal distributions - Do I need to do anything special? Statistical Analysis Tools, Techniques and SPC 5