Precision Measurement and Calibration: Statistical concepts and procedures, H. H. Ku, edU.S. Government Printing Office, 1968 |
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Page 4
... example , accuracy within .01 percent is sufficient for our purpose , the target center is the area within the next to the last circle . Our measurements may group on either side of dead center , or may be randomly scattered across the ...
... example , accuracy within .01 percent is sufficient for our purpose , the target center is the area within the next to the last circle . Our measurements may group on either side of dead center , or may be randomly scattered across the ...
Page 5
... example , 9.995 grams , or relative to the closest nominal value , in which case the point would be described as 10 grams minus 5 milligrams . The minus 5 milligrams may be called a correction or error , depending on one's viewpoint ...
... example , 9.995 grams , or relative to the closest nominal value , in which case the point would be described as 10 grams minus 5 milligrams . The minus 5 milligrams may be called a correction or error , depending on one's viewpoint ...
Page 16
... example , using only three of the observa- tions of the previous series , with S as the standard , A as the unknown , and B as the check standard , might give rise to the values shown . If everything were perfect , all equations ...
... example , using only three of the observa- tions of the previous series , with S as the standard , A as the unknown , and B as the check standard , might give rise to the values shown . If everything were perfect , all equations ...
Page 25
... examples , see , for instance , Youden [ 1951a ; and 1954-1959 ] . 2.5 . Measurement as a Production Process We may ... example , " move the two parallel cross hairs of the micrometer of the microscope until the graduation line of the ...
... examples , see , for instance , Youden [ 1951a ; and 1954-1959 ] . 2.5 . Measurement as a Production Process We may ... example , " move the two parallel cross hairs of the micrometer of the microscope until the graduation line of the ...
Page 30
... example , measurement of the distance between two points by means of a graduated metal tape [ Holman 1892 , p . 9 ] . Possible causes of systematic error that immediately come to mind are : ( 1 ) Mistakes in numbering the scale ...
... example , measurement of the distance between two points by means of a graduated metal tape [ Holman 1892 , p . 9 ] . Possible causes of systematic error that immediately come to mind are : ( 1 ) Mistakes in numbering the scale ...
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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 45 - ON THE ALGEBRAICAL AND NUMERICAL THEORY OF ERRORS OF OBSERVATIONS AND THE COMBINATION OF OBSERVATIONS.
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Page 72 - Manual on Quality Control of Materials (American Society for Testing and Materials, Philadephia, 1951).
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.