Dear all,
I recently use the optim function to find the maxima for some likelihood
function. I have many parameters, more than 12. As the help file mention,
the default method does not do well in univariate case. How about the
different method in optim?
I notice the nlm function uses newton
Dear all,
Is there any package in R, which can do the Dirichlet-Multinomial model fit?
It is a generalization of the beta-binomial model. I know Prof. Lindsay has
a package, whcih can estimate the beta-binomial parameter well. Is there
any counter part for Dirichlet-Multinomial? Thanks.
it is for windows. R can not start, one information windows says fatal
error: invalid homedrive.
From: Prof Brian Ripley [EMAIL PROTECTED]
To: David Scott [EMAIL PROTECTED]
CC: Joann Williamson [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Re: [R] Error with 1.9.0 - Invalid HOMEDRIVE
Date:
I find more interesting situation. My laptop (toshiba tecra9100) can run R
1.9.0 and the earlier version well when I connect to internet. The same
wrong error appears when I disconnect the internet.
One IBM laptop can not run R in any situation and one FUJITSE laptop never
met any error
happened since I
run R in batchs under Linux. Does this happen probably due to the memory
exhaust? (for some array(0,rep(2,10)), my codes work well).
From: Prof Brian Ripley [EMAIL PROTECTED]
To: Z P [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Subject: Re: [R] memory limit problem
Date: Mon, 5 Apr 2004
Do you mean in Linux, there is no need to set memory limit? If needed, how
to set it? Thanks.
From: Roger D. Peng [EMAIL PROTECTED]
To: Yi-Xiong Sean Zhou [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Subject: Re: [R] memory limit problem
Date: Sun, 04 Apr 2004 00:13:46 -0500
In general, this is
Dear all,
I now have a sequence of n-3:21, for each i, I define an array of dimension
array((1/2)^i,c(rep(2,i))), I must update the (i+1)-th array with a loop
according to the i-th array, How can I store all the previous arrays (the
marginal parts of the (i+1)-th array will not equal to the
Dear all,
Is there any package in R can do the GEE2? Thanks.
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Dear all,
Is there any package or function can do the pointwise confidence interval
and confidence band for the local polynomial regression? Maybe the local
linear regression is enough. Thanks.
Regards,
Zhen
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Dear all,
suppose I have a bi-variate function f(x,y), I want to find the maxima. I
define x and y vector, and get matrix z=f(x,y). how can I get which (x0,y0)
makes z become the maxima?
I can do two loops to get the x0 and y0, but I think there may exist a
function to do this.
Dear all,
Is there any function to draw a 2D histogram? I only can find some kernel
estimation. I now only want to draw the 2D histogram. Thanks.
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Dear all,
I am considering a problem related to density regression. After we got the
estimation of probability density function f(x), how can we estimate the
mode of that population?
Does the sm package support mode estimation? If not, is there any other
function in R can estimate the mode
Dear all,
I now want to get the numerical derivative of some multivariate function
y=f(x_1,...,x_k) at some specific point x_0=(x_10,...,x_k0).
I know deriv() funtion can give the numerical derivative when f is an known
fuction. Now the f is an unknown fuction, but I can give many points
Dear all,
I now want to get the numerical derivative of some multivariate function
y=f(x_1,...,x_k) at some specific point x_0=(x_10,...,x_k0).
I know deriv() funtion can give the numerical derivative when f is an known
fuction. Now the f is an unknown fuction, but I can give many points
Dear all,
I define , for n=5 or any integer greater than 0.
A-array((1/2)^n , c(rep(2,n)))
then for any i not equal to j, and 1=i,j=n,
B-apply(a,c(i,j),sum)
now B is a 2 by 2 matrix, I also define another costant 2 by 2 matrix G,
How can I change the values of each elements of array A,
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