diff options
author | ranke <ranke@5fad18fb-23f0-0310-ab10-e59a3bee62b4> | 2006-05-23 07:33:22 +0000 |
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committer | ranke <ranke@5fad18fb-23f0-0310-ab10-e59a3bee62b4> | 2006-05-23 07:33:22 +0000 |
commit | f381f9a6a8a47b89ec25cd627833a7248da7932b (patch) | |
tree | 3155c1f5b2f5810a453aa8cb8a8f44f5920b01e8 /man/lod.Rd | |
parent | e12be874ff477509b737ad09bf05144a7fbedac2 (diff) |
Don't do calplot and lod for linear models from weighted
regression any more, since this is not supported (PR#8877).
git-svn-id: http://kriemhild.uft.uni-bremen.de/svn/chemCal@13 5fad18fb-23f0-0310-ab10-e59a3bee62b4
Diffstat (limited to 'man/lod.Rd')
-rw-r--r-- | man/lod.Rd | 27 |
1 files changed, 22 insertions, 5 deletions
@@ -38,18 +38,35 @@ the analyte is present (type II or false negative error), is beta (also a one-sided significance test). } +\note{ + - The default values for alpha and beta are recommended by IUPAC. + - The estimation of the LOD in terms of the analyte amount/concentration + xD from the LOD in the signal domain SD is done by simply inverting the + calibration function (i.e. assuming a known calibration function). +} \references{ + Massart, L.M, Vandenginste, B.G.M., Buydens, L.M.C., De Jong, S., Lewi, P.J., + Smeyers-Verbeke, J. (1997) Handbook of Chemometrics and Qualimetrics: Part A, + Chapter 13.7.8 + J. Inczedy, T. Lengyel, and A.M. Ure (2002) International Union of Pure and Applied Chemistry Compendium of Analytical Nomenclature: Definitive Rules. Web edition. + + Currie, L. A. (1997) Nomenclature in evaluation of analytical methods including + detection and quantification capabilities (IUPAC Recommendations 1995). + Analytica Chimica Acta 391, 105 - 126. } \examples{ data(din32645) m <- lm(y ~ x, data = din32645) - # The decision limit (critical value) is obtained by using beta = 0.5: - lod(m, alpha = 0.01, beta = 0.5) # approx. Nachweisgrenze in Dintest 2002 - lod(m, alpha = 0.01, beta = 0.01) - # In the latter case (Erfassungsgrenze), we get a slight deviation from - # Dintest 2002 test data. + lod(m) + + # The critical value (decision limit, German Nachweisgrenze) can be obtained + # by using beta = 0.5: + lod(m, alpha = 0.01, beta = 0.5) + # or approximated by + 2 * lod(m, alpha = 0.01, beta = 0.5)$x + # for the case of known, constant variance (homoscedastic data) } \keyword{manip} |