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-rw-r--r--inst/doc/chemCal-001.pdf4
-rw-r--r--inst/doc/chemCal.Rnw13
-rw-r--r--inst/doc/chemCal.log4
-rw-r--r--inst/doc/chemCal.pdfbin107306 -> 107447 bytes
4 files changed, 10 insertions, 11 deletions
diff --git a/inst/doc/chemCal-001.pdf b/inst/doc/chemCal-001.pdf
index 748b5e1..9211cf1 100644
--- a/inst/doc/chemCal-001.pdf
+++ b/inst/doc/chemCal-001.pdf
@@ -2,8 +2,8 @@
%ρ\r
1 0 obj
<<
-/CreationDate (D:20060516214219)
-/ModDate (D:20060516214219)
+/CreationDate (D:20060517131400)
+/ModDate (D:20060517131400)
/Title (R Graphics Output)
/Producer (R 2.3.0)
/Creator (R)
diff --git a/inst/doc/chemCal.Rnw b/inst/doc/chemCal.Rnw
index 26b224f..77888b4 100644
--- a/inst/doc/chemCal.Rnw
+++ b/inst/doc/chemCal.Rnw
@@ -19,7 +19,7 @@ Ron Wehrens led to the belief that it could be heavily improved if the
inverse prediction method given in \cite{massart97} would be implemented,
since it also covers the case of weighted regression.
-At the moment, the package only consists of two functions, working
+At the moment, the package consists of three functions, working
on univariate linear models of class \texttt{lm} or \texttt{rlm}.
When calibrating an analytical method, the first task is to generate
@@ -27,6 +27,10 @@ a suitable model. If we want to use the \chemCal{} functions, we
will have to restrict ourselves to univariate, possibly weighted, linear
regression so far.
+For the weighted case, the function \code{predict.lm} had to be
+rewritten, in order to allow for weights for the x values used to
+predict the y values.
+
Once such a model has been created, the calibration can be graphically
shown by using the \texttt{calplot} function:
@@ -34,12 +38,7 @@ shown by using the \texttt{calplot} function:
library(chemCal)
data(massart97ex3)
attach(massart97ex3)
-yx <- split(y,factor(x))
-ybar <- sapply(yx,mean)
-s <- round(sapply(yx,sd),digits=2)
-w <- round(1/(s^2),digits=3)
-weights <- w[factor(x)]
-m <- lm(y ~ x,w=weights)
+m <- lm(y ~ x, w = rep(0.01,length(x)))
calplot(m)
@
diff --git a/inst/doc/chemCal.log b/inst/doc/chemCal.log
index d399d73..86ecc8e 100644
--- a/inst/doc/chemCal.log
+++ b/inst/doc/chemCal.log
@@ -1,4 +1,4 @@
-This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4) (format=pdflatex 2006.4.5) 16 MAY 2006 21:42
+This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4) (format=pdflatex 2006.4.5) 17 MAY 2006 13:14
entering extended mode
**chemCal.tex
(./chemCal.tex
@@ -346,4 +346,4 @@ type1/bluesky/cm/cmbx12.pfb> </var/cache/fonts/pk/ljfour/jknappen/tc/tctt1000.6
xmf-tetex/fonts/type1/bluesky/cm/cmtt10.pfb></usr/share/texmf-tetex/fonts/type1
/bluesky/cm/cmr10.pfb></usr/share/texmf-tetex/fonts/type1/bluesky/cm/cmr12.pfb>
</usr/share/texmf-tetex/fonts/type1/bluesky/cm/cmr17.pfb>
-Output written on chemCal.pdf (3 pages, 107306 bytes).
+Output written on chemCal.pdf (3 pages, 107447 bytes).
diff --git a/inst/doc/chemCal.pdf b/inst/doc/chemCal.pdf
index 6036bd3..5c6b1ea 100644
--- a/inst/doc/chemCal.pdf
+++ b/inst/doc/chemCal.pdf
Binary files differ

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