Displaying 12 results from an estimated 12 matches for "upstreamsystems".
2011 Dec 21
1
constrOptim and further arguments
...ng error,
'Error in heq(theta, ...) : unused argument(s) (RR = 0.0075)'
I do not appear to be able to input further arguments in this manner, any
help from the list would be gratefully received.
Regards
Mike Griffiths
On Tue, Dec 20, 2011 at 11:53 AM, Michael Griffiths <
griffiths@upstreamsystems.com> wrote:
> Dear List,
>
> I am using constrOptim to solve the following
>
> fr1 <- function(x) {
> b0 <- x[1]
> b1 <- x[2]
> ((1/(1+exp(-b0+b1))+(1/(1+exp(-b0)))+(1/(1+exp(-b0-b1)))))/3
> }
>
> As you can see, my objective function is
>...
2011 Nov 15
2
Regular expressions in R
...iously still not understanding something. If the list could offer
some guidance I would be most grateful.
Regards
Mike Griffiths
--
*Michael Griffiths, Ph.D
*Statistician
*Upstream Systems*
8th Floor
Portland House
Bressenden Place
SW1E 5BH
<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9DxUmWw>
Tel +44 (0) 20 7869 5147
Fax +44 207 290 1321
Mob +44 789 4944 145
www.upstreamsystems.com<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9Dx...
2011 Dec 19
1
None-linear equality constrained optimisation problems
...in R.
Can the community suggest another method by which this might be solved?
As ever, many thanks for your time.
Mike Griffiths
--
*Michael Griffiths, Ph.D
*Statistician
*Upstream Systems*
8th Floor
Portland House
Bressenden Place
SW1E 5BH
<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9DxUmWw>
Tel +44 (0) 20 7869 5147
Fax +44 207 290 1321
Mob +44 789 4944 145
www.upstreamsystems.com<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9Dx...
2011 Dec 20
1
constrOptim and problem with derivative
...incorrectly in my
specification of grr in constrOptim.
If the list could help, I would be most grateful.
Regards
Mike Griffiths
--
*Michael Griffiths, Ph.D
*Statistician
*Upstream Systems*
8th Floor
Portland House
Bressenden Place
SW1E 5BH
<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9DxUmWw>
Tel +44 (0) 20 7869 5147
Fax +44 207 290 1321
Mob +44 789 4944 145
www.upstreamsystems.com<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9Dx...
2011 Nov 14
2
Help with text separation
...having the need for the
aforementioned spaces.
If the list can offer help, I would be most appreciative.
Yours
Mike Griffiths
--
*Michael Griffiths, Ph.D
*Statistician
*Upstream Systems*
8th Floor
Portland House
Bressenden Place
SW1E 5BH
<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9DxUmWw>
Tel +44 (0) 20 7869 5147
Fax +44 207 290 1321
Mob +44 789 4944 145
www.upstreamsystems.com<http://www.google.com/url?q=http%3A%2F%2Fwww.upstreamsystems.com%2F&sa=D&sntz=1&usg=AFrqEzfKYfaAalqvahwrpywpJDL9Dx...
2010 Oct 01
1
'all subsets' fitting algorithm for Bayesian approach
...le functions which would make the separations and constructions required easy to achieve?
Thanks in advance to all
Michael Hopkins
Algorithm and Statistical Modelling Expert
Upstream
23 Old Bond Street
London
W1S 4PZ
Mob +44 0782 578 7220
DL +44 0207 290 1326
Fax +44 0207 290 1321
hopkins@upstreamsystems.com
www.upstreamsystems.com
IMPORTANT NOTICE
The information in this e-mail and any attached files is...{{dropped:22}}
2010 Sep 24
1
Some questions about string processing
...d I be looking at here and are there any examples available?
Thanks in advance. Feel free to CC me on your reply.
Michael Hopkins
Algorithm and Statistical Modelling Expert
Upstream
23 Old Bond Street
London
W1S 4PZ
Mob +44 0782 578 7220
DL +44 0207 290 1326
Fax +44 0207 290 1321
hopkins@upstreamsystems.com
www.upstreamsystems.com
IMPORTANT NOTICE
The information in this e-mail and any attached files is...{{dropped:22}}
2010 Oct 12
0
general construction of 'all pairwise comparison' contrast in ANOVA
...Are there any functions or libraries in R that will allow me to do this without too much grief?
Thanks in advance
Michael Hopkins
Algorithm and Statistical Modelling Expert
Upstream
23 Old Bond Street
London
W1S 4PZ
Mob +44 0782 578 7220
DL +44 0207 290 1326
Fax +44 0207 290 1321
hopkins@upstreamsystems.com
www.upstreamsystems.com
[[alternative HTML version deleted]]
2011 Sep 08
5
General help - online statistics courses?
I understand this isn't a r specific question. I'm switching departments to
work with the analytics team at my company as a "service" side manager to
better incorporate the analytics process into product design / production.
We're an online gaming company.
As I'm going through tools like R, rapidminer, tableau, I was also thinking
that I should get some formal training
2010 Oct 15
1
creating 'all' sum contrasts
OK, my last question didn't get any replies so I am going to try and ask a different way.
When I generate contrasts with contr.sum() for a 3 level categorical variable I get the 2 orthogonal contrasts:
> contr.sum( c(1,2,3) )
[,1] [,2]
1 1 0
2 0 1
3 -1 -1
This provides the contrasts <1-3> and <2-3> as expected. But I also want it to create <1-2> (i.e.
2010 Oct 31
1
R-help Digest, Vol 92, Issue 31
...or me.
cheers
--
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------------------------------
Message: 5
Date: Fri, 29 Oct 2010 12:00:59 +0100
From: Michael Hopkins <hopkins@upstreamsystems.com>
To: r-help@r-project.org
Subject: [R] multiple weights in MANOVA
Message-ID: <44E5CA63-ADDB-4958-87BC-8BFFE625052F@upstreamsystems.com>
Content-Type: text/plain
Hi all
I have 7 responses that I want to fit with MANOVA. I have accumulated the
responses into a matrix Y and each res...
2011 Mar 10
0
OptFederov and Dopt.design
Dear R users,
I have used the AlgDesign package to construct a D-optimal exp. design from
a file containing a set of allowed runs. The code for the optFederov call is
below:
#Using optFederov ------------------------------
library(AlgDesign)
options(contrasts=c("contr.sum","contr.poly"))
file<- read.table("C:/Upstream/Designs/Vodacom Tanzania phase1