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2001 Oct 07
1
Bug in Deriv? (PR#1119)
....expr4 <- exp(-x - xmid/scal) #### Wrong !!!!
> deriv(~offv+Asym/(1+exp(-x/scal+xmid/scal)),"x")
expression({
.expr5 <- exp(-x/scal + xmid/scal) ## Correct
> deriv(~offv+Asym/(1+exp((xmid-x)/scal)),"x")
expression({
.expr3 <- exp((xmid - x)/scal) ## Coorrect
> deriv(~offv+Asym/(1+exp(-1.0*(x-xmid)/scal)),"x")
expression({
.expr5 <- exp(-1 * (x - xmid)/scal) ## Correct
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Dr. Dieter Menne
Biomed Software
72074 Tübingen
Tel (49) (7071) 52176
FAX (49) (7071) 55 10 46
dieter.menne@menne-biomed.de...
2002 Dec 18
3
summary stats including NA's into new dataframe
List,
I am trying to extract summary statistics from a data frame with several
variables (and NAs) into a dataframe with the columns: Variablename (ie the
colnames of original data), mean, stdev, max, min, Valid N, Missing Values.
Extracting the statistics is straightforward using stack and aggregate.
However, I haven''t succeeded in obtaining the number of Missing Values. I
can extract