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Cummins ISB LTMS2. This package contains charts and figures that supplement the LTMS2 template put forth by Statistics Task Group. LTMS2 Template document name: “Cummins ISB LTMS Version 2 Proposal.docx”

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Cummins isb ltms2
Cummins ISB LTMS2

This package contains charts and figures that supplement the LTMS2 template put forth by Statistics Task Group.

LTMS2 Template document name:

“Cummins ISB LTMS Version 2 Proposal.docx”

The LTMS2 template contains possible values for the various chart limits. Page 2 of this document summarizes these values.

Pages 3-11 show the control charts and alarms of LTMS1 and proposed LTMS2.

Pages 12-14 contain some comments on Excessive Influence calculations and alarms in LTMS1&2.

Art Andrews

November 30, 2010


Ltms1

LTMS1

focus: Shewhart severity (Y) alarms




Ltms2

LTMS2

focus: e alarms




Comparisons ltms1 ltms2

Comparisons LTMS1 / LTMS2

focus: number of reference interval extensions and reductions


Cummins isb ltms2

Reference Interval Extensions and Reductions

37 total reference oil results

12 were calibration tests

37-12=25 tests were eligible for extended intervals

9/25 (36%) received extended intervals in LTMS2

7/37 (18.9%) failed in LTMS2


Cummins isb ltms2

RMSE

overall for all labs

RMSE

by lab


Appendix

Appendix

Comments on

Excessive Influence

and

Alarms


Cummins isb ltms2

Tappet weight loss severity charts showing Excessive Influence calculation

Excessive Influence calculation adjusted Y results from green filled circle to cyan circle.


Cummins isb ltms2

Tappet weight loss precision charts showing e Influence calculation

These are examples of results that trigger alarms in LTMS2 but not LTMS1. While their Y results are not excessive, their e values are high (~1.1) because they outlie the lab’s Z baseline (~-0.9).

This is an example of a result that would trigger alarm in either LTMS1 and LTMS2. It has a high Y value that exceeds LTMS1 limit. It has a high e value because its result (~2.8) outlies the lab’s Z baseline (~0.1).

The dotted line is Level 2 e alarm, and solid line Level 3 e alarm