Displaying 20 results from an estimated 5000 matches similar to: "importing timestamp data into R"
2007 Jan 04
3
randomForest and missing data
Does anyone know a reason why, in principle, a call to randomForest
cannot accept a data frame with missing predictor values? If each
individual tree is built using CART, then it seems like this
should be possible. (I understand that one may impute missing values
using rfImpute or some other method, but I would like to avoid doing
that.)
If this functionality were available, then when the trees
2003 Aug 26
1
rfImpute (for randomForest) crashed
In trying to execute this line in R (Version 1.7.1 (2003-06-16), under
windows XP pro), with the randomForest library (about two weeks old) loaded,
the program crashed:
bost4rf <- rfImpute(TargetDensity~.,data=bost4rf0)
Specifically, an XP dialog box popped up, saying ?R for windows GUI
front-end has encountered a problem and needs to close.? That was the
dialog saying asking whether I
2007 Aug 10
1
rfImpute
I am having trouble with the rfImpute function in the randomForest package.
Here is a sample...
clunk.roughfix<-na.roughfix(clunk)
>
> clunk.impute<-rfImpute(CONVERT~.,data=clunk)
ntree OOB 1 2
300: 26.80% 3.83% 85.37%
ntree OOB 1 2
300: 18.56% 5.74% 51.22%
Error in randomForest.default(xf, y, ntree = ntree, ..., do.trace = ntree,
:
NA not
2009 May 08
1
Error while using rfImpute
Dear Administrator,
I am using linux (suse 10.2). While attempting rfImpute, I am getting the
following error message:
> Members <- rfImpute(Status ~ ., data = Members)
Error in .C("classRF", x = x, xdim = as.integer(c(p, n)), y =
as.integer(y), :
C symbol name "classRF" not in DLL for package "randomForest".
I need the help to sort out above error.
2010 Jun 30
2
anyone know why package "RandomForest" na.roughfix is so slow??
Hi all,
I am using the package "random forest" for random forest predictions. I
like the package. However, I have fairly large data sets, and it can often
take *hours* just to go through the "na.roughfix" call, which simply goes
through and cleans up any NA values to either the median (numerical data) or
the most frequent occurrence (factors).
I am going to start
2008 May 05
1
Problems using rfImpute
Hello R-user!
I am running R 2.7.0 on a Power Book (Tiger). (I am still R and
statistics beginner)
I tried rfImpute (randomForest) and as far as I understood should it
replace NA`s using a proximity matrix:
> set.seed(100000)
> Subset5Imputed<-rfImpute(Sex~., data=Subset5)
ntree OOB 1 2
300: 11.78% 12.36% 11.21%
ntree OOB 1 2
300: 12.07% 12.64%
2006 Mar 29
2
missing value replacement for test data in random forest
Hi,
In R, how to do missing value replacement for test data in randome forest in the way Breiman decribed.
thanks in advance
iris
2004 Jul 26
5
installing problems repeated.tgz linux
Hi,
i try several possibilities adn looking in the archive,
but didn't getting success to install j.lindsey's usefuel "library
repeated" on my linux (suse9.0 with kernel 2.6.7,R.1.9.1)
P.S. Windows, works fine
Many thanks for help
Christian
chris at linux:/space/downs> R CMD INSTALL - l /usr/lib/R/library repeated
WARNING: invalid package '-'
WARNING:
2013 Jan 28
1
RandomForest and Missing Values
Dear All,
I would like to use a randomForest algorithm on a dataset.
The set is not particularly large/difficult to handle, but it has some
missing values (both factors and numerical values).
According to what I found
https://stat.ethz.ch/pipermail/r-help/2005-September/078880.html
https://stat.ethz.ch/pipermail/r-help/2007-January/123117.html
the randomForest package has a problem with missing
2010 Jul 06
4
Adding two files into one and vlookup
I have two files with dates and prices in each. The number of rows in each of
them will differ. How do I create a new file which contains data from both
these files? Cbind and merge are not helpful. For cbind because the rows are
not the same replication occurs. Also if I have similar data how do I write
a vlookup kind of function? I am giving an example below:
Say Price1 file contains the
2012 Mar 26
1
NA in R package randomForest
I have a question regarding NA in randomForest (in R). I have a dataset
which include both numerical and non-numerical variables, and the data
includes some NA. I tried to use na.roughfix but then i get an error
message "na.roughfix only works for numeric or factor". I also tried
rfImpute but this does not work either because I have some NA in my
response variable. Does anyone have som
2003 Aug 05
1
na.action in randomForest --- Summary
A few days ago I asked whether there were options other than
na.action=na.fail for the R port of Breiman?s randomForest; the function?s
help page did not say anything about other options.
I have since discovered that a pdf document called ?The randomForest
Package? and made available by Andy Liaw (who made the tool available in
R---thank you) does discuss an option. It is an implementation of
2011 Dec 02
2
Imputing data
So I have a very big matrix of about 900 by 400 and there are a couple of NA
in the list. I have used the following functions to impute the missing data
data(pc)
pc.na<-pc
pc.roughfix <- na.roughfix(pc.na)
pc.narf <- randomForest(pc.na, na.action=na.roughfix)
yet it does not replace the NA in the list. Presently I want to replace the
NA with maybe the mean of the rows or columns or
2009 Sep 25
2
synchronisation of time series data using interpolation
Readers,
I have data with different time stamps that I wish to plot (for example):
data set 1
time(hh:mm:ss),datum
01:00:00,500
01:00:15,600
01:00:30,750
01:00:45,720
01:01:00,700
01:01:15,725
01:01:30,640
01:01:45,710
data set 2
time,datum
01:00:12,20
01:01:01,55
01:01:55,22
The time interval in data set 1 does not change, but the time interval
in data set 2 does change, such that for a
2004 Mar 31
3
help with the usage of "randomForest"
Dear all,
Can anybody give me some hint on the following error msg I got with using
randomForest?
I have two-class classification problem. The data file "sample" is:
----------------------------------------------------------
udomain.edu udomain.hcs hpclass
1 1.0000 1 not
2 NA 2 not
3 NA 0.8 not
4 NA 0.2 hp
5 NA 0.9 hp
------------------------------------------------------------
The
2010 Apr 01
2
time series problem: time points don't match
Hi,
I have a time series problem that I would like some help with if you have
the time. I have many data from many sites that look like this:
Site.1
date time level temp
2009/10/01 00:01:52.0 2.8797 18.401
2009/10/01 00:16:52.0 2.8769 18.382
2009/10/01 00:31:52.0 2.8708 18.309
2009/10/01 00:46:52.0 2.8728 18.285
2009/10/01 01:01:52.0
2010 Sep 23
4
plotting multiple animal tracks against Date/Time
Dear list,
I would like to create a time series plot in which the paths of several individuals are stacked above each other, with the x-axis being the total observation period of three years ( 1.1.2004 to 31.12.2007) and the y-axis being some defined range[min,max].
My data consist of Date/Time information and the paths of 45 individual as the distance from the location of release. An example
2013 Feb 15
2
data formatting
Dear Eliza,
Try this:
Lines1<-readLines(textConnection("1911.01.01?????? 7.87
1911.01.02?????? 9.26
1911.01.03?????? 8.06
1911.01.04?????? 8.13
1911.01.05????? 12.90
1911.02.06?????? 5.45
1911.02.07?????? 3.26
1911.03.08?????? 5.70
1911.03.09?????? 9.24
1911.04.10?????? 7.60
1911.05.11????? 14.82
1911.05.12????? 14.10
1911.06.13?????? 7.87
1911.06.14?????? 9.26
2007 Jan 29
3
comparing random forests and classification trees
Hi,
I have done an analysis using 'rpart' to construct a Classification Tree. I
am wanting to retain the output in tree form so that it is easily
interpretable. However, I am wanting to compare the 'accuracy' of the tree
to a Random Forest to estimate how much predictive ability is lost by using
one simple tree. My understanding is that the error automatically displayed
by the two
2005 Sep 12
0
[handling] Missing [values in randomForest]
Hi Jan-Paul,
You definitely want to be careful with na.omit in randomForest -- that
wipes out any row with even one NA. If NAs are sprawled throughout your
dataset, na.omit might end up killing a lot of rows. Here's my usual MO
for missing values:
1) "impute" in Hmisc fills in gaps with the mean, median, most common
value, etc.
2) rfImpute: fits a forest on the rows available and