Displaying 4 results from an estimated 4 matches for "leachate".
2008 Jun 05
1
choosing an appropriate linear model
...w to create a better predictive model? I presume it has
something to do with glm, especially since I have repeated rainfalls on
replicate samples, but any advice on the approach to take would be much
appreciated. The code I used to produce the attached plots is included
below.
leach.lm <- lm(leachate~rainmm-1,data=leachdata)
png("dianostics.png",height=1200,width=700)
par(mfrow=c(3,2))
plot(leachate~rainmm,data=leachdata,main="Data and fitted line")
abline(leach.lm)
plot(predict(leach.lm)~leachdata$leachate,main="predicted vs. observed
leaching amount",xlim=c(0,12...
2011 Oct 12
1
getting data associated with coordinates in a spatial data frame
If I know the specific coordinate in a spatial data frame, how can I access the data at that coordinate?
My coordinates are labeled "x" and "y" in a data.frame "e". The data is in column "leachate".
I want to say, basically:
e$leachate@coordinates(2,3<mailto:e$leachate@coordinates(2,3>).
Thanks, Daniel
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2005 Mar 26
5
PCA - princomp can only be used with more units than variables
Hi all:
I am trying to do PCA on the following matrix.
N1 N2 A1 A2 B1 B2
gene_a 90 110 190 210 290 310
gene_b 190 210 390 410 590 610
gene_c 90 110 110 90 120 80
gene_d 200 100 400 90 600 200
>dataf<-read.table("matrix")
>
2008 Jun 06
6
Subsetting to unique values
I want to take the first row of each unique ID value from a data frame.
For instance
> ddTable <-
data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry"))
I want a dataset that is
Id Name
1 Paul
2 Bob
> unique(ddTable)
Will give me all 4 rows, and
> unique(ddTable$Id)
Will give me c(1,2), but not accompanied by the name column.