: William Asquith, [EMAIL PROTECTED]
Sent: 2006-07-17, 16:18:31
To: Leaf Sun, [EMAIL PROTECTED]
Subject: Re: [R] Weibull distribution
Do not have answer per se, but if you are seeking some
comparisons--
try three parameter Weibull as implemented by the lmomco package
please? Any suggestion would be
appreciated!
Leaf
- Original Message -
From: William Asquith, [EMAIL PROTECTED]
Sent: 2006-07-17, 16:18:31
To: Leaf Sun, [EMAIL PROTECTED]
Subject: Re: [R] Weibull distribution
Do not have answer per se, but if you are seeking some
Thanks for the suggestion! I switched to optimize(), al - optimize(f.fn, lower
= 0.1, upper =100,tol=0.001);
the warnings were gone and it works stably.
But when I tried al - uniroot(f.fn, lower = 0.1, upper =100,tol=0.001);
error occured: f() values at end points not of opposite sign. The
Hi all,
I found r-site-research not work for me these days.
When I was doing nls( ) , there was an error number of iterations exceeded
maximum of 50. I set number in nls.control which is supposed to control the
number of iterations but it didn't work well. Could anybody with this
experience
Sorry, I thought it was a straightforward question inside which I was stuck .
I used nls( ) to estimate a and b in this function.
nls(y~ a*x^b,start=list(a=a1,b=b1)
seems the start list I gave was not able to reach convergence and it gave
notes: number of iteration s exceeded maximum of 50.
Thanks to Douglas and all others who responded.
I applied nls(y ~ a*x^b, start = list(a = a1, b = b1), control =
list(maxiter = 500), trace=TRUE) to increase the number of iterations, found
it successful. The suggestion Douglas raised in plotting the data and then
tracing the
Hi all,
By its definition, the mean and variance of two-par. Weibull distribution are:
(www.wikipedia.org)
I was wondering, if given mean and sd. could we parameterize the distribution?
I tried this in R.
gamma.fun - function(mu,sd,start=100)
{
f.fn - function(alpha)
Hi R-listers,
I have a simple question about a data frame.
I sorted a data set by one of the variable in some condition (eg. X=0), the
followed is part of the achieved. I was wondering how can I get the row name,
i. e. (1202, 2077 , 2328, 3341,... ) and save them as a vector.
Dear all,
I have a date frame like this:
X Y Z
22 24 4.3
2.3 3.4 5.3
.
57.223.434
What my purpose is: to sort the data frame by either X, Y or Z.
sample output is (sorted by X) :
X Y Z
2.3 3.4 5.3
.
..
22 24 4.3
...
57.2 23.4 34
I have
Dear all,
I got point data of trees. I was wondering if anybody has experience in
searching the neighbors within a specified distance efficiently.
XY Z
99 34 65
98 35 29
98 34 28
99 33 33
98 32 23
99 33 21
99 33
Hi all,
Has anybody have the experience in the errors:
Error in data.frame(..., check.names=FALSE): arguments imply differing number
of rows: 343,15
This is the error occured in the middle of the program. I don't think the data
frame has any problem, if there is problem with the program, why
, 04:31:54 you wrote: ===
On Mon, 24 Oct 2005, Leaf Sun wrote:
Running R 2.2.0 on winXP. Computer P4 CPU 3.2G and 1G of RAM.
Please try the attached Windows binary package. Look at the help page for
ann.dist(). It returns a list of three elements, the first, lnn, gives the
index numbers
Dear listers,
A quick question about breaks in hist().
The histogram is highly screwed to the right, say, the range of the vector is
[0, 2], but 95% of the value is squeezed in the interval (0.01, 0.2). My
question is : how to set the breaks then make the histogram look even?
Thanks in
=== At 2005-11-02, 12:07:12 you wrote: ===
Leaf Sun wrote:
The histogram is highly screwed to the right, say, the range
of the vector is [0, 2], but 95% of the value is squeezed in
the interval (0.01, 0.2).
I guess the histogram is as you wrote. See
http://web.maths.unsw.edu.au
Dear all,
Is there any simple way in R that can I put the all the interactions of the
variables in the OLS model?
e.g.
I have a bunch of variables, x1,x2, x20... I expect then to have
interaction (e.g. x1*x2, x3*x4*x5... ) with some combinations(2 way or higher
dimensions).
Is there
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Leaf Sun
Sent: Sunday, November 06, 2005 3:11 AM
To: r-help@stat.math.ethz.ch
Subject: [R] OLS variables
Dear all,
Is there any simple way in R that can I put the all
Sorry about this, I didn't know. I guess I have posted too much garbage on here.
Thanks to Edzer for your answers!
Leaf
=== At 2005-11-09, 02:14:21 you wrote: ===
Leaf, please note that r-help is not the appropriate place to ask
package-specific questions. We have r-sig-geo for
Dear all,
I'd like to change a point pattern to a grid of cells and use one of the
variables as the output.
e.g. The point pattern is of a window of (500*500) and several features such
as pH, SoilType etc. I like to divide it into a grid with cell size 5*5, and
use the mean of the point
2005, Leaf Sun wrote:
Dear all,
I'd like to change a point pattern to a grid of cells and use one of the
variables as the output.
e.g. The point pattern is of a window of (500*500) and several features
such as pH, SoilType etc. I like to divide it into a grid with cell
size 5*5, and use
Hi all,
I need to write and read a list in R. I did r.site.search, found there is a
package rmutil doing this, unfortunately it is not on the list of package.
In another words, I can't install it from any CRAN mirror.
Anybody has idea about this? or any suggestion about the list? Thanks!
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