This webinar will show you how to check for normality in your data and apply transformations to non-normal data. Many of the commonly used statistical tests and calculations of chart limits (or other measurements) require that the data be “normally distributed”.
Learn the theory and concepts of determining when a normal distribution is needed, how to transform data that is not normal, and what to do when transformation does not work.
Why Should You Attend
The FDA requires that company to have “valid statistical techniques” are “suitable for their intended use”. Many statistical tests require that the distribution of the data used is normal. Assuming that the distribution of data is normal, without checking to see if indeed it is normal, will cause errors in test results.
Errors in results will cause bias of interpretation, rejection of lots that should be passed (or vice versa, passing lots that should be rejected), failing processes that are in specification (or vice versa…), and other problems. In essence, performing many statistical tests and other measurements without the basis of a normal distribution is garbage in, garbage out (GIGO).
In this webinar, you will also learn tools and concepts to understand what makes a distribution normal and when a transformation of data is, or is not, necessary.
- Regulatory Requirements
- History of the Normal Distribution
- The Normal Distribution in Mathematical and Visual Form.
- To Transform or Not to Transform?
- Tests to assess the degree of non-normality.
- Evaluating normality visually.
- When transformations can do more harm than good.
- Other Options when Data is Not Normally Distributed
Key Learning Objectives
- Understand when a test requires normal data
- Test and visually inspect data for normality.
- Learn when a transformation of data is needed, and how to transform data.
- When the “Normality Assumption” can be “relaxed”.
- Alternative tests and/or adjustments to use for non-normal data.
Who Will Benefit
- QA/QC Supervisor
- Process Engineer
- Manufacturing Engineer
- QA/QC Technician
- Manufacturing Technician
- R&D Engineer
- Data Scientist
Elaine Eisenbeisz (30+ year Exp.)
Statistician. I develop solid statistical analysis plans and/or well-informed data analyses and reportings.
Greater Los Angeles Area
Elaine Eisenbeisz is a private practice statistician and owner of Omega Statistics, a statistical consulting firm based in Southern California. Elaine has over 30 years of experience in creating data and information solutions for industries ranging from governmental agencies and corporations, to start-up companies and individual researchers.
In addition to her technical expertise, Elaine possesses a talent for conveying statistical concepts and results in a way that people can intuitively understand.
Our Participants Testimonial
"Elaine is absolutely the best, nicest, easiest to work with and the most fabulous statistician that I have worked with. I cannot say enough about her. I have been in academic medicine for 25 years now and founded a small biotech company. With Elaine's help on data, we were just purchased by Sanofi-Aventis, the 3rd largest pharma company! She helped our company so very much and no question was ever left unanswerable. You are making an excellent choice!"
Resa Levetan, MD - Co-Founder, Cure DM
"Elaine is a wonderful statistics-oriented resource person who has both technical knowledge and business savvy. Having assisted my needs for a quality statistician, Elaine provided me with a well-planned and timely portfolio to aid in my research. She is very personable, and I highly recommend her impeccable data services."
Cirrelia Thaxton, Ph.D - Education