Precision Measurement and Calibration: Statistical concepts and procedures, H. H. Ku, edU.S. Government Printing Office, 1968 |
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Page 4
... limits . In 4 of the 6 examples , the process uncertainty is of the same order of magnitude as the quantity we are trying to check . These examples illustrate the necessity for a careful evaluation before venturing a commit- ment on the ...
... limits . In 4 of the 6 examples , the process uncertainty is of the same order of magnitude as the quantity we are trying to check . These examples illustrate the necessity for a careful evaluation before venturing a commit- ment on the ...
Page 5
... limits on the value of the standard as the error automatically disregards the primary benefits of a good calibration . Only an ideal measurement method or process can produce true values of multiples and subdivisions of the basic unit ...
... limits on the value of the standard as the error automatically disregards the primary benefits of a good calibration . Only an ideal measurement method or process can produce true values of multiples and subdivisions of the basic unit ...
Page 13
... LIMITS..UNCERTAINTY OR ACCURACY Figure 38 A measurement process is essentially a produc- tion process , the " product " being numbers , that is , the measurements . A characteristic of a meas- urement process is that repeated ...
... LIMITS..UNCERTAINTY OR ACCURACY Figure 38 A measurement process is essentially a produc- tion process , the " product " being numbers , that is , the measurements . A characteristic of a meas- urement process is that repeated ...
Page 14
... LIMITS BASED ON GROUP VARIABILITY -NEXT MEASUREMENT GROUP Figure 42 The group means may tend to a limit and the process may have all the properties of a good meas- urement system , once the allowance is made for the grouping . It is ...
... LIMITS BASED ON GROUP VARIABILITY -NEXT MEASUREMENT GROUP Figure 42 The group means may tend to a limit and the process may have all the properties of a good meas- urement system , once the allowance is made for the grouping . It is ...
Page 15
... limits within which the next value should lie . In the case where we have an extremely long sequence , a bar , as illustrated in the chart , can be marked off on either side of the mean so that some suitable fraction , say 99 percent ...
... limits within which the next value should lie . In the case where we have an extremely long sequence , a bar , as illustrated in the chart , can be marked off on either side of the mean so that some suitable fraction , say 99 percent ...
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Common terms and phrases
adjusted values analysis applied arithmetic mean ASTM average b₁ b₁x bias Bureau of Standards calculated calibration Churchill Eisenhart comparison components computed confidence interval confidence limits constant control chart correct corresponding curve degrees of freedom determinations effect equal equation evaluation example experiment experimental factors Figure formulas gage block given imprecision independent intercept interlaboratory interval estimate labora laboratory large number Least Squares limiting mean linear magnitude mass materials mathematical meas measurement process ment National Bureau normal distribution number of measurements observations obtained operation ORDP pair paper parameters percent plotted points population possible quantity radium standard range ratio relationship reported sample scores sequence Shewhart shown single slope sources specimens standard deviation standard error stations statistical control systematic error Table temperature test procedure tion tory true value uncertainty urement variables variance W. J. Youden W₁ weight
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Page 36 - It is another matter to formulate specific statements regarding these statistical characteristics of measurement processes. 4.2. 1 Precision — Precision may be stated in terms of an index of precision of the form ±a, where a is some positive number. The numerical value of a in any such index of precision will be smaller the more closely bunched are the individual measurements of a process. However, any such index must have a clearly understandable interpretation regarding variability of measurements....
Page 31 - Absolute certainty is a privilege of uneducated minds — and fanatics. It is, for scientific folk, an unattainable ideal.