Bias and Linearity with Slip Gauge: Low R-Squared Value

T

Thothathiri

#1
Bias and Linearity

We purchased a New Digimatic Micrometer of a reputed make. We conducted the Bias and Linearity study with Slip Gauge, and we anlysed the result using the Regression. The R square value we got from the study if 0.69 as against 0.98. can any one comment on the study result. What might went wrong with the Micrometer as its new. At the same time we conducted GR&R study with this instrument and we got GR&R value less than 10%.

------------------
 
Elsmar Forum Sponsor
D

Drew H

#2
Either there was an error in conducting the linearity study or the gage is very non-linear. Did you graph the results of the linearity study - could give you some idea of the source of the problem. The GR&R study is telling you things are consistent - i.e. repeatable. It gives the same measurement each time and the operators don't have any trouble making the measurement. I would look closely at the bias over the range of use and the linearity - if these don't meet manufacturer's specs, send it back!

[This message has been edited by Drew H (edited 07 December 2000).]
 
D

David Drue Stauffer

#3
Hi. Just like to remind y'all that bias is defined as the observed average deviation from the target value (measurement standard) before any calibration adjustments are made to the instrument and thereby used to discern if there is a need to do an impact study on product acceptance. Sorry bout the long sentence. Linearity, is a study to determine the accuracy of a gage throughout its measurement range for the same purpose. All those calculated values really don't mean that much. The goal is to discover if THIS gage is capable of controlling your process to acceptable SPC Indices. IF there is a problem, then it becomes necessary to investigate to find out IF this has impacted product acceptance. Remember the tire company?
 
Thread starter Similar threads Forum Replies Date
A Acceptance p-value for linearity and bias analysis in minitab results Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 0
M How calculate P value for Linearity and Bias using Excel Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 8
E Company-wide MSA - Measurement Equipment Bias, Linearity & Stability Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
G Bias & Linearity Study and the Uncertainty of Standards Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 8
M Are Bias, Stability, and Linearity studies required by TS 16949 7.6.1? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
E Gage Linearity and Bias Questions Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
I Interpretation of MSA (Measurement Systems Analysis) Linearity and Bias Study Results Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
T Bias & Linearity Study - How to calculate the P value for the Average Bias Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 8
A Bias Linearity Stability MSA Excel File with Formula Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
C Linearity and Bias Study Compliance Requirements Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
L Gage Linearity and Bias Study Analysis - Minitab help needed Using Minitab Software 4
T Gage Bias and Linearity - How to interpret the Minitab results Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
S MSA 4th Edition formats in Excel wanted - GR&R, Bias, Stability and Linearity Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 8
M Linearity, BIAS & Stability - How many studies do I need to do for a device? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
L Recommend a 3rd Party Certifier for Master Value in Linearity & Bias Study General Measurement Device and Calibration Topics 0
S Stability, Bias and Linearity samples - Measurement Systems Analysis Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
B In a Linearity Study covering the operating range is it necessary to do Bias Study? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
M When to use Linearity and Bias - appropriate for paper tensile strength? Quality Tools, Improvement and Analysis 6
S If I do Linearity and Bias Studies, are Stability Studies Required? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
A Linearity and Bias Study - Bias Study fails - Seeking advice Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 7
P Linearity & Bias Acceptable Percentage Guideline - Digimatic micrometer General Measurement Device and Calibration Topics 2
D MSA - Can Regular Calibration Replace Bias, Linearity and Stability Studies? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
D Stability, Linearity vs. Bias - Do we need to compute them all? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
A Do we need to perform Stability, Linearity & Bias study for Attribute data? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
A Interpretation of output for Minitab - P value & %linearity or % bias Using Minitab Software 1
A Is minitab 'AIAG compliant' to perform GR&R, linearity and bias study? Using Minitab Software 4
M Laser Mike Insturment - MSA - Which (Bias, Linearity, Stability, R&R) are applicable? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
H MSA Excel .xls worksheet that includes GR&R (Gage R&R), Bias, Linearity, etc. Excel .xls Spreadsheet Templates and Tools 15
D Gauge R & R and stability, linearity and bias Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
Courier MSA Tools - Excel templates for doing the Linearity & Bias, & Stability Studies Excel .xls Spreadsheet Templates and Tools 13
G Bias & Linearity Calculations and T Value Formula in the AIAG's MSA Manual Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
A Error in MSA Manual - Discrimination - Bias Linearity Worksheet Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 7
B Scales - Gage R&R, Bias, Linearity, Stability Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
Z Linearity of Bias in MSA - Why is it important? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
R Acceptance Criteria for Linearity and Bias Studies - Engine Valves Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
S 4.11.4 MSA is R&R Enough? Linearity, bias, stability necessary as well? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
J Gage R&R Software which provides Bias and Linearity Information Quality Assurance and Compliance Software Tools and Solutions 1
F Meeting the AIAG's MSA Manual Gage R&R Bias, Linearity, Stability requirements Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 18
F Element 4.11.4 - Meeting the MSA requirements of bias, linearity, stability QS-9000 - American Automotive Manufacturers Standard 1
A Bias Linearity and Stablility vs. Wide Tolerances vs. Process Capability Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
D Gage R&R - Acceptance Criteria for Linearity, Bias, and Stability Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
M MSA Manual 3rd Edition - R&R, Linearity, Bias, Stability - Small Company Many Gages Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 11
L Measurement System Analysis (MSA) - Bias, Linearity and Stability Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 23
G Can Measurement Machine Bias be part of Uncertainty? General Measurement Device and Calibration Topics 1
A Hypothesis test for Bias, not for GRR. WHY ?? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
Wes Bucey A rant against gender bias wherever it appears Career and Occupation Discussions 4
J Bias formula in MSA 4th Edition vs 3rd Edition Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
0 The Uncertainty of an Estimate of the Bias ISO 5725-1 - Help Measurement Uncertainty (MU) 8
E Bias and Type 1 Study Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
G Conducting a Bias Study for a CMM with no Traceable Master or Reference value Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4

Similar threads

Top Bottom