Displaying 20 results from an estimated 2000 matches similar to: "Imputing NAs using transcan(); impute()"
2007 Sep 26
1
using transcan for imputation, categorical variable
Dear all,
I am using transcan to impute missing values (single imputation). I have
several dichotomous variables in my dataset, but when I try to impute
the missings sometimes values are imputed that were originally not in
the dataset. So, a variable with 2 values (severe weight loss or
no/limited weight loss) for example coded 0 and 1, shows 3 different
values after imputation (0, 1 and 2).
I
2005 Jan 11
1
transcan() from Hmisc package for imputing data
Hello:
I have been trying to impute missing values of a data
frame which has both numerical and categorical values
using the function transcan() with little luck.
Would you be able to give me a simple example where a
data frame is fed to transcan and it spits out a new
data frame with the NA values filled up?
Or is there any other function that i could use?
Thank you
avneet
=====
I believe in
2004 Nov 30
2
impute missing values in correlated variables: transcan?
I would like to impute missing data in a set of correlated
variables (columns of a matrix). It looks like transcan() from
Hmisc is roughly what I want. It says, "transcan automatically
transforms continuous and categorical variables to have maximum
correlation with the best linear combination of the other
variables." And, "By default, transcan imputes NAs with "best
2012 Jul 05
0
Confused about multiple imputation with rms or Hmisc packages
Hello,
I'm working on a Cox Proportional Hazards model for a cancer data set that has missing values for the categorical variable "Grade" in less than 10% of the observations. I'm not a statistician, but based on my readings of Frank Harrell's book it seems to be a candidate for using multiple imputation technique(s). I understand the concepts behind imputation, but using
2005 May 04
3
Imputation
I have timeseries data for some factors, and some missing values are there in those factors, I want impute those missing values without disturbing the distribution of that factor, and maintaining the correlation with other factors. Pl. suggest me some imputation methods.
I tried some functions in R like aregImpute, transcan. After the imputation I am unable to retrive the data with imputed
2007 Jun 22
1
Imputing missing values in time series
Folks,
This must be a rather common problem with real life time series data
but I don't see anything in the archive about how to deal with it. I
have a time series of natural gas prices by flow date. Since gas is not
traded on weekends and holidays, I have a lot of missing values,
FDate Price
11/1/2006 6.28
11/2/2006 6.58
11/3/2006 6.586
11/4/2006 6.716
11/5/2006 NA
11/6/2006 NA
11/7/2006
2004 Aug 14
0
Re: extracting datasets from aregImpute objects
From: <david_foreman at doctors.org.uk>
Subject: [R] Re: extracting datasets from aregImpute objects
To: <r-help at stat.math.ethz.ch>
Message-ID: <1092391719_117440 at drn10msi01>
Content-Type: text/plain; charset="us-ascii"
I've tried doing this by specifying x=TRUE, which provides me with a
single imputation, that has been useful. However, the help file
2003 Jun 16
1
Hmisc multiple imputation functions
Dear all;
I am trying to use HMISC imputation function to perform multiple imputations
on my data and I keep on getting errors for the code given in the help
files.
When using "aregImpute" the error is;
>f <- aregImpute(~y + x1 + x2 + x3, n.impute=100)
Loading required package: acepack
Iteration:1 Error in .Fortran("wclosepw", as.double(w), as.double(x),
2008 Nov 26
1
multiple imputation with fit.mult.impute in Hmisc - how to replace NA with imputed value?
I am doing multiple imputation with Hmisc, and
can't figure out how to replace the NA values with
the imputed values.
Here's a general ourline of the process:
> set.seed(23)
> library("mice")
> library("Hmisc")
> library("Design")
> d <- read.table("DailyDataRaw_01.txt",header=T)
> length(d);length(d[,1])
[1] 43
[1] 2666
2004 Jun 15
1
fit.mult.impute and quantile regression
I have a largish dataset (1025) with around .15 of the data missing at random overall, but more like .25 in the dependent variable. I am interested in modelling the data using quantile regression, but do not know how to do this with multiply imputed data (which is what the dataset seems to need). The original plan was to use qr (or whatever) from the quantreg package as the 'fitter'
2008 Jun 30
3
Is there a good package for multiple imputation of missing values in R?
I'm looking for a package that has a start-of-the-art method of
imputation of missing values in a data frame with both continuous and
factor columns.
I've found transcan() in 'Hmisc', which appears to be possibly suited
to my needs, but I haven't been able to figure out how to get a new
data frame with the imputed values replaced (I don't have Herrell's book).
Any
2003 Jul 25
1
Difficulty replacing NAs using Hmisc aregImpute and Impute
Hello R experts
I am using Hmisc aregImpute and Impute (following example on page 105 of The
Hmisc and Design Libraries).
*My end goal is to have NAs physically replaced in my dataframe. I have
read the help pages and example in above sited pdf file, but to no avail.
Here is example of what I did.
Ph, my data frame, is attached.
> xt <- aregImpute (~ q5 + q22rev02 + q28a, n.impute=10,
2008 Oct 29
1
Help with impute.knn
ear all,
This is my first time using this listserv and I am seeking help from the
expert. OK, here is my question, I am trying to use impute.knn function
in impute library and when I tested the sample code, I got the error as
followingt:
Here is the sample code:
library(impute)
data(khanmiss)
khan.expr <- khanmiss[-1, -(1:2)]
## ## First example
## if(exists(".Random.seed"))
2010 Nov 01
1
Error message in fit.mult.impute (Hmisc package)
Hello,
I would like to use the aregImpute and fit.mult.impute to impute missing
values for my dataset and then conduct logistic regression analyses on the
data, taking into account that we imputed values. I have no problems
imputing the values using aregImpute, but I am getting an error at the
fit.mult.impute stage.
Here is some sample code (I actually have more observations and variables to
2009 Jan 23
0
Package impute exist in quite different version on CRAN and BioC
[CC:ing package maintainer of 'impute' package and crossposting to
r-devel and bioc-devel because this affects both audiences]
Hi,
the 'impute' package is published both on CRAN and Bioconductor;
http://cran.r-project.org/web/packages/impute/
http://bioconductor.org/packages/2.3/bioc/html/impute.html
The one on CRAN is v1.0-5, and the one on BioC is v1.14.0.
The two
2007 May 10
0
Need help imputing missing data using mice and outputting them
Hello!
I am trying to impute missing data and output the results of the imputation.
My data set is called: MyData.
I have a bunch of variables all of which start with Q20_ - and some of them have missing values.
Here is what I've been doing:
imputationmodel<-mice( MyData[ c (grep("Q20_", names(MyData)) ) ] )
multipledataset<-complete(imputationmodel,action="long")
2012 Aug 17
0
impute multilevel data in MICE
Dear list,
I have a question about imputing 2 level data in MICE, could you give me some suggestions please? Thank you very much.
The data set contains 35634 cases and 1007 variables, 280 of them are categorical variables, and the rest of them are continuous variables. On the second level, there are 198 units. I am trying to impute missing values for 270 categorical variables by using the
2010 Dec 02
1
problem with package rsm: running fit.mult.impute with cph
Hi all (and especially Frank),
I'm trying to use x=T, y=T in order to run a validated stepwise cox
regression in rsm, having multiply imputed using mice. I'm coding
model.max<-fit.mult.impute(baseform,cph,miced2,dated.sexrisk2,x=T,y=T)
baseform is
baseform<-Surv(si.age,si=="Yes")~ peer.press + copy.press + excited +
worried + intimate.friend + am.pill.times +
2009 Aug 11
0
how to do model validation and calibration for a model fitted by fit.mult.impute?
Dear all,
I used fit.mult.impute in Dr. Harrell's Design package to fit a cox ph
regression model on five imputed datasets, where all missing predictors
were filled by multiple imputation using R package Mice. Are there any
functions able to do bootstrapping or cross-validation for the
aggregated model? I tried function 'validate' and 'calibrate' in Design
package, but
2005 Jul 09
1
aregImpute: beginner's question
Hello R-help,
Thanks for everyone's very helpful suggestions so far. I am now trying to
use aregImpute for my missing data imputation. Here are the code and error
messages. Any suggestions would be very much appreciated.
Sincerely,
Anders Corr
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