Displaying 20 results from an estimated 400 matches similar to: "EM algorithm to find MLE of coeff in mixed effects model"
2012 Jul 03
0
need help EM algorithm to find MLE of coeff in mixed effects model
Dear All,
have a general question about coefficients estimation of the mixed model.
I simulated a very basic model: Y|b=X*\beta+Z*b +\sigma^2* diag(ni);
b follows
N(0,\psi) #i.e. bivariate normal
where b is the latent variable, Z and X are ni*2 design matrices, sigma is
the error variance,
Y are longitudinal data, i.e. there are ni
2000 Oct 12
2
works in R-1.1.1 but not in R-development; why?
Dear All,
A library (PHYLOGR) that passed the usual tests in R-1.1.1 gives errors with
R-devel; my (mis?)understanding of scoping rules is
that it should have worked in both. The problems seem related to using the
name of the data frame for extracting weights or subsets within a function
call. The problems can be reproduced as follows:
**********************
datai <- data.frame( y =
2006 Jun 26
2
probably need to se sapply but i can't get it
Hi : I think I need to use sapply but I can't figure this out.
Suppose I have two vectors : tempa ( 4, 6,10 ) and tempb
( 11,23 ,39 )
I want a function that returns 4:11,6:23 and 10:39 as vectors.
I tried :
sapply(1:length(tempa) function (z) seq(tempa[z],tempb[z])
but i got 3 really strange vectors back in the sense that the numbers in them did not make no sense to me. obviously,
i
2006 Nov 16
1
getting a title in a plot during an lapply
In my code below tempa and tempb are numeric vectors that I combined
into a dataframe along with the deciles of tempa.
I have an lapply statement that goes through the dataframe and does ten
plots according to the appropriate decile.
The code is below and it works fine. There are no bugs so I figure there
was no need to include structure statements on the data.
Also, I don't want to use coplot
2011 Aug 01
4
Use dump or write? or what?
Greetings all,
I am calculating two t-test values for each of many files then save it
to file calculate another set and append, repeat.
But I can't figure out how to write it to file and then append
subsequent t-tests.
(maybe too tired ;} )
I have tried to use "dump" and "file.append" to no avial.
ttest_results = tempfile()
two_sample_ttest <- t.test (tempA, tempB,
2005 May 25
3
Problem with systemfit 0.7-3 and transformed variables
The 'systemfit' function in systemfit 0.7-3 CRAN package seems to have a
problem with formulas that contain transformed (eg. log) variables. If I
have my data in a data frame, apparently systemfit doesn't "pass" the
information of where the variables should be taken to the transforming function.
I'm not entirely sure if this is a bug or just a limitation, I was just
2006 Jun 27
1
related to my previous sapply question]
in my previous post in which i asked about creating sequences
from two vectors of numbers, all suggestions worked.
tradevectors<-mapply(seq,from=tempa,to=tempb)
or
tradevectors<-sapply(1:length(tempa),function(x) seq(tempa[x],tempb[x])
>both return a list with 3 components.
the problem is that i want to take these 3 sequences and
use them as the indices of two other vectors, X and
2008 Jun 04
2
converting a table to a dataframe or a matrix
can someone show me how to convert a table to a data.frame or a matrix ?
I tried below and as.data.frame rearranges the columns
similarly to a melt from reshape and as.matrix didn't change it. I
actually would prefer to change it to a dataframe but if someone
can show me how to convert it to a matrix, then as.data.frame will work
on that. I was thinking about just changing the class to
2008 Mar 19
2
nil-error
Hi all,
I''ve got the error below in my backgroundrb_debug.log. I''ve tried to
reproduce the error in the development environment, but the only way I
can get the same thing is by calling ask_work with a bogus worker
name. Calling it with the production code causes no error.
Here''s an example of what the code calls:
MiddleMan.ask_work(:worker => :agronomy_worker,
2009 Sep 20
1
Return a list from a .Call but segfaults
Hello,
I call a function via .Call passing to it a raw vector(D) and an
integer(I)
The vector is a series K1,KData1, V1,VData1, K2, KData2, ...
where the integer K1 is the length of Data1 and similarly for Ki (wrt
Datai)(similarly for V*) There 2*I such pairs( (Ki,KDatai), (Vi,VDatai))
The numbers Ki(and Vi) are written in network order.
I am returning a list of I elements each element a
2006 Jun 28
2
hopefully my last question on lapply
Marc and many other people ( whose names escape me ) have been
very helpful in explaining the use of lapply to me.
In his last response, Marc explained that if tradevectors is a list
of vectors of different lengths ( excuse my terminology ) then
lapply(tradevectors,function(x) G[x]*B[x] )
will go through each component of the list as if it was a vector
and apply the element by element
2017 Jun 28
2
About the concept of "materialization"
OK. About the error it’s a long story, so it’s probably better to pin some source code here. Below is a piece of code related to my problem, clipped from lib/Transforms/Utils/ValueMapper.cpp. I was wondering what “materialized” means here.
Value *Mapper::mapBlockAddress(const BlockAddress &BA) {
Function *F = cast<Function>(mapValue(BA.getFunction()));
// F may not have
2000 Jun 02
3
graphical parameters in plot
I'm using plot to make a simple plot but I want to control where
the tick marks go on bot axes. The graphical parameters xaxp and
yaxp seem to be ignored by the plot function so I tried setting them
using
op <- par(no.readonly=T)
par(xaxp=c(-2.4,-2.2,5), yaxp=c(-2500,10000,6))
plot(...)
par(op)
but they are still ignored.
Next I tried to use the axis function as follows
op <-
2006 Jun 01
1
setting the random-effects covariance matrix in lme
Dear R-users,
I have longitudinal data and would like to fit a model where both the variance-covariance matrix of the random effects and the residual variance are conditional on a (binary) grouping variable.
I guess the model would have the following form (in hierarchical notation)
Yi|bi,k ~ N(XiB+Zibi, sigmak*Ident)
bi|k ~ N(0, Dk)
K~Bernoulli(p)
I can obtain different sigmas (sigma0 and
2008 Oct 22
4
A matrix automation problem
[I am really sorry if it is double posted, I doubt me previous post could not
reach forum due to some problem with net]
Suppose I have a matrix :
a = matrix(1:9, 3)
>From this matrix, I construct 9 additional matrices :
i = 1:9
bi = a * i
Now combining all those 9 new matrices, I construct a final metrix as :
c =
b1 b4 b7
b2 b5 b8
b3 b6 b8
I want to automate this procedure for any
2017 Jun 28
2
About the concept of "materialization"
Bruce,
Thanks for the explanation. But based on my inspection on the source code, it seems that materialization is related to lazily reading LLVM objects (Module, Function, etc.) into the memory from bitcode files, which is possibly useful during LTO. I’m not sure though.
Pei
From: <bruce.hoult at gmail.com> on behalf of Bruce Hoult <bruce at hoult.org>
Date: Wednesday, June 28,
2012 May 30
1
caret() train based on cross validation - split dataset to keep sites together?
Hello all,
I have searched and have not yet identified a solution so now I am sending
this message. In short, I need to split my data into training, validation,
and testing subsets that keep all observations from the same sites together
? preferably as part of a cross validation procedure. Now for the longer
version. And I must confess that although my R skills are improving, they
are not so
2005 Sep 23
2
Strange behaviour of as.Date function
Dear All,
I'm happily extracting data of temperature from an oracle db
under R via RODBC. After manipulating the extracted data I put them
into a data.frame 'dati' which is as follows:
> dati
DATA tm.
UDINE/RIVOLTO tm.TORINO/CASELLE
1 2005-07-01
22.35 23.80
2 2005-07-02 22.70
22.85
3 2005-07-03 23.80
2018 May 25
1
Share periodical not accessible
Thank you for your response! Here comes the smb.conf…
André
— smb.conf —
# Global parameters
[global]
workgroup = LOPRODUCTS
realm = LOPRODUCTS.LOCAL
server role = member server
security = ads
server string = %h server (Samba, Ubuntu)
netbios name = fireball
disable netbios = yes
wins support = no
domain master = no
local master = no
preferred master = no
os level = 0
dns forwarder
2007 Dec 25
6
error: no marshal_dump is defined for class Thread
I get this error periodically in backgroundrb.log, but only on my
production box (the one running ruby 1.8.5) - my dev box doesn''t get
this error. As far as I can tell, everything is working ok, despite
the error (I don''t really know how to determine if the jobs are
getting threaded successfully, but they are running, that I am sure
of).
Here''s the dump:
no