Sources of error in determination of available lysine in cottonseed and peanut meals

1973 ◽  
Vol 50 (8) ◽  
pp. 304-306 ◽  
Author(s):  
V. L. Frampton ◽  
J. C. Kuck
Keyword(s):  
Sources Of Error ◽  
Available Lysine

THE DISTRIBUTION OF IONIZATION ALONG UNDERDENSE METEOR TRAILS

1964 ◽  
Vol 42 (11) ◽  
pp. 2035-2047 ◽  
Author(s):  
D. W. Rice ◽  
P. A. Forsyth
Keyword(s):  
Upper Atmosphere ◽  
Sources Of Error ◽  
Signal Characteristics ◽  
Radio Signals ◽  
Meteor Trails

Attempts to use the decay of radio signals reflected from individual meteor trails to study the upper atmosphere have revealed a puzzling inconsistency in the signal behavior. An earlier paper pointed out that this inconsistency remained even when the previously postulated sources of error were eliminated. As a result, an irregularly ionized trail model was proposed and shown, by calculation of signal characteristics, to be capable of accounting for the observations. This paper presents results of a new experiment which permitted the determination of the ionization profiles as the meteor trails were formed. The predicted irregularities were found, even for trails which exhibited apparently "ideal" underdense signal characteristics.

Instrumental and Procedural Sources of Error in Determination of Bile Pigments in Amniotic Fluid

1972 ◽  
Vol 18 (2) ◽  
pp. 150-154 ◽  
Author(s):  
Robert W Burnett
Keyword(s):  
Amniotic Fluid ◽  
Error Propagation ◽  
Obstet Gynecol ◽  
Bile Pigments ◽  
Linear Estimation ◽  
Sources Of Error ◽  
Significant Bias ◽  
Accuracy And Precision ◽  
Baseline Estimation

Abstract Although the Liley spectrophotometric estimation of bile pigments in amniotic fluid [Amer. J. Obstet. Gynecol. 82, 1359 ( 1961)] is widely used, the levels of accuracy and precision necessary for clinically meaningful results have not been clarified. This paper delineates some of the important instrumental and procedural sources of error, and how each affects the final value of ΔA455: (a) A limit of error propagation is presented to show that the uncertainty in ΔA455 due to instrumental factors is considerably larger than is commonly appreciated. (b) It is desirable to use a logarithmic baseline estimation, as did Liley, instead of a linear estimation, which can introduce a serious bias. (c) Failure to establish a true zero-absorbance baseline before scanning the specimen can also result in a significant bias in the calculated ΔA455.

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