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Running with Scissors

Presenter: Paul Sheehy, Principal, Paul Sheehy Consulting, Brewer, ME, USA

Keywords: Statistics, Assumptions, Common Errors

Industry: Education/Training, Manufacturing, Service

Level: Intermediate


ABSTRACT

Give people a powerful tool (statistics) with insufficient training, and you likely have a case of somebody “running with scissors.” This talk will cover some of the more common statistical mistakes including:

  • Misapplication of the normality assumption and normality testing with a discussion of which statistical tools or methods are sensitive to the assumption, which are moderately affected and which are robust to it. Additionally, a method to validate normality with large samples will be demonstrated.
  • Questions regarding the equal variance assumption for the 2-Sample t test and One-Way ANOVA. This will include the use of the Welch’s test.
  • Criticality of rational subgroups in control charting and capability.
  • In measurement systems, the issues arising from the use of the small number of parts in a typical Gage R&R study to estimate the variation of the process which, if unverified, may result in a seriously incorrect denominator when calculating the % gage R&R. There will be a discussion on the value of using a historical standard deviation as a check.
  • Issues that can seriously impact the ability of a Capability Analysis to predict the future performance of the process. Discussion will include the effects due to insufficient data, insufficient time, subgroup problems, and lack of stability. The concept of a Capability Snapshot will be presented.


Call for Proposals

Proposal Submission Deadline:
October 11, 2019

Acceptance notification date:
November 11, 2019

Early Registration Deadline:
February 11, 2020

Please make sure to review and prepare the material needed before you start the on-line Proposal Submission Form. Click here to see Proposal Submission Guidelines.

Who May Submit: This online form may be used by a principal speaker, co-speaker, contact person, or a committee member submitting on behalf of a speaker.

Multiple Proposals: You may submit multiple proposals.

Conference Registration Fee:
The conference registration fee is waived for the principal speaker of accepted proposals. Speakers are responsible for their travel expenses and arrangements. Co-speakers will receive a 30% discount for the conference that they are presenting at.

Length of Presentations: Technical sessions are typically 35 minutes. There will be a limited number of "double" sessions, 70 minutes, at the end of each day.

You will need the following to submit a proposal

Proposal Title: Maximum 80 characters including spaces. 

Keywords:Please include three keywords with a maximum of 100 characters, including spaces. 

Industry Sector: Please select the most relevant Industry sector for the proposal from a list.

Abstract: The Abstract should be 1,500 to 5,000 characters (note that it is Characters, NOT words), including spaces.

Biography: The Biography must be 1,500 to 5,000 characters, including spaces.

Public Profile: LinkedIn or Public Profile for link for the Principal Speaker: 

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