1 / 16

C13 LTMS discussion Follow-up to San Antonio O&H meeting

C13 LTMS discussion Follow-up to San Antonio O&H meeting. Elisa Santos November 29 th , 2005. Objective. Reevaluate the decision made during the O&H meeting The group decided to use targets and standard deviations based on 29 tests (matrix plus concurrent tests) without taking into account

chione
Télécharger la présentation

C13 LTMS discussion Follow-up to San Antonio O&H meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. C13 LTMS discussion Follow-up to San Antonio O&H meeting Elisa Santos November 29th, 2005

  2. Objective • Reevaluate the decision made during the O&H meeting • The group decided to use targets and standard deviations based on 29 tests (matrix plus concurrent tests) without taking into account • that Lab F is different from all the other labs in Delta OC • and that Lab B is different from the other labs in TLC • The immediate consequence of using inflated standard deviations is that all stands will calibrate • Also, the control chart bounds generated for the chosen reference oil will be affected by this decision, making it harder to detect Lab shifts

  3. Data source • 29 tests from the ltms file • 23 matrix tests for PC10 oils • 3 tests for PC10 G • 3 concurrent tests • Critical parameters: • Delta OC • TGC • TLC • R2TCA (not included)

  4. Delta OC Excluding Lab F • Transformation: square root • Oil discrimination • Labs are similar • Final model: Lab & Oil Type • RMSE = 0.59 Including Lab F • Transformation: square root • Oil discrimination • Lab F is different from all Labs • Final model: Lab & Oil Type • RMSE = 0.57

  5. square root of Delta OC

  6. Means, Standard Deviations, LSMEANS & Oil discriminationBefore and After removing Lab F Before RMSE = 0.57 After RMSE = 0.59

  7. Options for Delta OC • Summary for potential reference oils • PC10 B: • Original RMSE: 0.57 • Original STDEV: 0.73; Eliminating Lab F: 0.32 • PC10 E: • Original RMSE: 0.57 • Original STDEV: 1.43; Eliminating Lab F: 0.76 • The other oils have only three or two tests associated to them • Option1: Use LSMEANS and Unique RMSE for Delta (using data from all labs) • Option2: Use Means and Standard deviations after removing Lab F from the calculations • Option 3: Use Means and Standard deviations (using data from all labs)

  8. Outlier screened TGC • Final model: Lab & Oil • RMSE = 6.47 • No Oil discrimination • Lab G different from Lab A LSMEANS for Oil LSMEANS for Lab Cylinder Effect

  9. OTGC RMSE = 6.47 Lab G different from Lab A

  10. Options for OTGC • Option1: Use LSMEANS and Unique RMSE for OTGC (using data from all labs) • Option 3: Use Means and Standard deviations (using data from all labs)

  11. scrnd TLC • Final model: Lab & Oil Type • RMSE= 4.69 • PC10 F is different from all oils except for PC10 C & PC10 G • Lab B different from Lab A and Lab G. • The severity of Lab B is more clear with the Tech & Base Oil analysis. LSMEANS for Oil LSMEANS for Lab

  12. scrnd TLC RMSE = 4.69

  13. Means and Standard Deviations before and after removing Lab B Before RMSE = 4.69 After RMSE = 4.5

  14. Options for scrnd TLC • Option1: Use LSMEANS and Unique RMSE for scrnd TLC (using data from all labs) • Option2: Use Means and Standard deviations after removing Lab B from the calculations • Option 3: Use Means and Standard deviations (using data from all labs)

  15. Impact on calibration • Options considered for the three parameters: • Shewhart calibration 111 (Option 1 for Delta/ Option 1 for OTGC/ Option 1 for scrnd TLC) • Shewhart calibration 212 (Option 2 for Delta/ Option 1 for OTGC/ Option 2 for scrnd TLC) • Shewhart calibration 333 (Option 3 for Delta/ Option 3 for OTGC/ Option 3 for scrnd TLC) • … there are other combinations, but these are the ones I generated • Look at EXCEL spreadsheet ..\Excel files\Discussion about Targets and precision.xls • Shewhart calculations by parameter • EWMA for severity adjustments (?)

  16. Summary of Impact on Lab/ Stand calibrationRow Color represents oil type A Shewhart Cal row different from zero indicates that that particular Yi is falling out of the K bounds for at least one parameter

More Related