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David Coleman
David Coleman
David Coleman
is an applied statistician with Alcoa Technical Center in Alcoa Center, PA.
Articles by David Coleman
Statistics in Analytical Chemistry: Part 49—Relative Standard Deviations and Detection
Monday, August 27, 2012
It is possible to associate a relative standard deviation or the more general relative measurement uncertainty (RSD and RMU, respectively) with a detection limit (DL).
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Statistics in Analytical Chemistry: Part 48—Relative Standard Deviations (RSDs)
Tuesday, June 05, 2012
The previous installment dealt with several regression practices that are risky in the world of calibration and recovery.
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Statistics in Analytical Chemistry: Part 47—Risky Calibration Practices
Monday, April 09, 2012
In analytical chemistry, simple linear regression is often used to perform calibration or recovery activities.
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Statistics in Analytical Chemistry: Part 46—R
2
(Concluded)
Wednesday, February 08, 2012
Over the course of the past two articles (Part 44,Oct 2011, and Part 45, Nov/Dec 2011), R2 has been defined, its components have been explained verbally and mathematically, and the statistic’s ...
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Statistics in Analytical Chemistry: Part 45—R
2
(Continued)
Tuesday, November 01, 2011
In the previous installment (American Laboratory, Oct 2011), the terms that contribute to R2 were defined and a formula relating them was developed.
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Statistics in Analytical Chemistry: Part 44—R
2
Saturday, October 01, 2011
Imagine that a new method has been developed and now needs a calibration curve.
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Statistics in Analytical Chemistry: Part 43—Pass-Fail Methods (Concluded)
Monday, June 13, 2011
The previous article (American Laboratory, Apr 2011) ended with an unsolved problem: how to implement a pass-fail method if the blank matrix contains a non-negligible amount of the analyte.
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Statistics in Analytical Chemistry: Part 42—Pass-Fail Methods
Wednesday, April 06, 2011
In the past articles, the discussions about methods have always dealt with procedures that estimate sample concentrations over a range of levels.
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Statistics in Analytical Chemistry: Part 41—Blanks (Concluded)
Friday, January 28, 2011
The previous article (American Laboratory, Oct 2010) left off with two interesting questions: 1) How does an analyst decide whether a positive response for a blank is low enough to be ignored? and 2) ...
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Statistics in Analytical Chemistry: Part 40—Blanks
Friday, October 29, 2010
There are indeed statistical issues related to blanks. To set the stage, a discussion of the concept itself will be helpful.
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Statistics in Analytical Chemistry: Part 39—Inexact Replicates: Example
Thursday, August 12, 2010
The previous installment (Part 38, American Laboratory, May 2010) outlined the regression-diagnostic steps needed when replicates are not exact.
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Statistics in Analytical Chemistry: Part 38—Inexact Replicates
Tuesday, May 18, 2010
In this series of articles, all of the regression discussions to date have assumed that the replicate preparations of a given concentration have been exact.
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Statistics in Analytical Chemistry: Part 37—Deviations, Errors, and Intervals (Oh My!)
Thursday, February 18, 2010
For the past seven years, this column has chiefly presented basic material related to a single theme: regression analysis of analytical data and the associated uncertainty.
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Statistics in Analytical Chemistry: Part 36—Significant Digits (Concluded)
Tuesday, January 26, 2010
The previous article (Part 35, American Laboratory, Aug 2009) introduced the concept of significant digits, pointing out that a statistically sound treatment will: 1) result in a formula that depends ...
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Statistics in Analytical Chemistry: Part 35—Reporting Data and Significant Digits
Thursday, August 20, 2009
"In almost all cases when dealing with a limit of detection or limit of determination, the primary purpose of determining that limit is to stay away from it.”
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