Normality Testing: Applications and Issues

Speaker

Instructor: Steven Wachs
Product ID: 706899
Training Level: Intermediate

Location
  • Duration: 90 Min
This webinar discusses applications of normality testing and several issues that may arise when testing data for normality. Several methods for testing data for normality are presented. We discuss some of the common types of goodness-of-fit tests that may be used (e.g. Andersen-Darling, Kolmogorov Smirnoff, etc.). We also discuss common reasons that normality tests are rejected.
RECORDED TRAINING
Last Recorded Date: Jun-2023

 

$249.00
1 Person Unlimited viewing for 6 month info Recorded Link and Ref. material will be available in My CO Section
(For multiple locations contact Customer Care)

$299.00
Downloadable file is for usage in one location only. info Downloadable link along with the materials will be emailed within 2 business days
(For multiple locations contact Customer Care)

 

 

Customer Care

Fax: +1-650-362-2367

Email: [email protected]

Read Frequently Asked Questions

Why Should You Attend:

Many types of statistical analyses assume that the underlying raw data follow a Normal Distribution. Common examples include Analysis of Variance (ANOVA), t tests, F tests, and Process Capability analyses using Normal methods. It is important to test the assumption of normality before using methods that require it.

Many practitioners simply perform normality tests and react to the results without enough understanding of important issues such as sample size implications, impact of outliers, etc. on the test results.

This webinar introduces probability distributions and the Normal (Gaussian) Distribution specifically. The key characteristics and distribution parameters that define the normal model are discussed in the introduction. The concept of distribution model fitting is presented and reasons for normality testing are reviewed.

Next, several methods for testing data for normality are presented. Although some older techniques are referenced, we emphasize the use of probability plotting and goodness-of-fit tests to provide objective assessments of normality. The methodology of hypothesis testing as applied to goodness-of-fit tests is described in detail. We emphasize the correct interpretation of normality test results (e.g. using p-values). We also discuss the risks of making errors in hypothesis tests and how to control those risks.

We provide several common scenarios that lead to rejection of normality. An understanding of these situations is important for determining appropriate actions when a normality tests fails. We discuss outliers, unstable processes, and issues caused by discreteness in the data.

Next, we discuss some of the common types of goodness-of-fit tests that may be used (e.g. Andersen-Darling, Kolmogorov Smirnoff, etc.). They differ several aspects and their properties are useful to understand to select an appropriate test. The sample size chosen for normality testing can significantly impact the results, and we discuss the relationship between sample size and the power of normality tests. More data is not necessarily better in this application. We provide some suggestions for sample sizes.

Since a common reason for rejecting normality is the presence of one or more potential “outliers”, we present some outlier tests that may be used (Grubbs, Dixon). We also discuss when it may be appropriate to exclude data from the analysis.

Learning Objectives:

  • Understand the Normal Distribution and how it is characterized
  • Know when normality testing is important
  • Apply probability plotting and goodness-of-fit tests for testing normality of the data
  • Interpret graphical results and p-values from normality testing
  • Diagnose why normality tests fail
  • Understand the differences between some of the common goodness-of-fit tests
  • Determine appropriate sample sizes for normality testing
  • Perform and interpret outlier tests
  • Understand justification for excluding data from normality tests

Areas Covered in the Webinar:

  • The Normal Distribution and Other Models
  • Why Test for Normality?
  • Normality Testing Methods
  • Reasons for Rejecting Normality
  • More on Normality Testing
  • Statistical Test for Outliers
  • Questions and Answers

Who Will Benefit:

  • Data Analysts
  • Quality Engineering or Quality Assurance Personnel
  • Product Design and Development personnel
  • Manufacturing personnel
  • Supplier Quality personnel
  • Process Engineers
  • Six Sigma Green Belts or Black Belts
  • Scientists
  • R&D Personnel
Instructor Profile:
Steven Wachs

Steven Wachs
Principal Statistician, Integral Concepts, Inc

Steven Wachs has 30 years of wide-ranging industry experience in both technical and management positions. He has worked as a statistician at Ford Motor Company where he has extensive experience in the development of statistical models, reliability analysis, designed experimentation, and statistical process control.

Mr. Wachs is currently a Principal Statistician at Integral Concepts, Inc. where he assists manufacturers in the application of statistical methods to reduce variation and improve quality and productivity. He also possesses expertise in the application of reliability methods to achieve robust and reliable products as well as estimate and reduce warranty. Mr. Wachs regularly speaks at industry conferences and provides workshops in industrial statistical methods worldwide.

He has an M.A. in Applied Statistics from the University of Michigan, an M.B.A, Katz Graduate School of Business from the University of Pittsburgh, 1992, and a B.S., Mechanical Engineering from the University of Michigan.

Follow us :

 

 

Refund Policy

Our refund policy is governed by individual products and services refund policy mentioned against each of offerings. However in absence of specific refund policy of an offering below refund policy will be effective.
Registrants may cancel up to two working days prior to the course start date and will receive a letter of credit to be used towards a future course up to one year from date of issuance. ComplianceOnline would process/provide refund if the Live Webinar has been cancelled. The attendee could choose between the recorded version of the webinar or refund for any cancelled webinar. Refunds will not be given to participants who do not show up for the webinar. On-Demand Recordings can be requested in exchange. Webinar may be cancelled due to lack of enrolment or unavoidable factors. Registrants will be notified 24hours in advance if a cancellation occurs. Substitutions can happen any time. On-Demand Recording purchases will not be refunded as it is available for immediate streaming. However if you are not able to view the webinar or you have any concern about the content of the webinar please contact us at below email or by call mentioning your feedback for resolution of the matter. We respect feedback/opinions of our customers which enables us to improve our products and services. To contact us please email [email protected] call +1-888-717-2436 (Toll Free).

 

 

+1-888-717-2436

6201 America Center Drive Suite 240, San Jose, CA 95002, USA

Follow Us

facebook twitter linkedin youtube

 

Copyright © 2023 ComplianceOnline.com MetricStream
Our Policies: Terms of use | Privacy

PAYMENT METHOD: 100% Secure Transaction

payment method