Displaying 11 results from an estimated 11 matches for "halford".
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salford
2010 Oct 12
2
repeating an analysis
...the model I will get a slightly different output. I want
to extract the nsplit number corresponding to the lowest xerror for each run
of the model (in this case it is for nsplit = 0) over 50 runs and then look
at the distribution of nsplits after 50 runs.
Any help appreciated.
Andy
--
Andrew Halford
Associate Researcher
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2011 Aug 10
3
plot 3d info in 2d
...the bubbles
is proportional to the sites location in 3d space (I am stuck on this
option). So sites that are very near the 2d plane of the xy axes would be
larger while sites that are actually further away in 3 d space would be
proportionally smaller.
any help/advice appreciated
Andy
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2010 Nov 12
1
goodness-of-fit test
...message
Goodness-of-fit test for poisson distribution
X^2 df P(> X^2)
Pearson 2573372 33 0
Warning message:
In summary.goodfit(gf) : Chi-squared approximation may be incorrect
Am I getting caught out because of zero counts or frequencies in my data?
Andy
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2011 May 26
1
ordiellipse
...it works fine except one of my groups
contains only 2 sites and I cannot get an ellipse around them. I'm assuming
that 2 points is not enough to perform the relevant calculations here,
however I would like to plot one if I could, if only for the sake of
pictorial consistency.
Andy
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2011 Aug 09
2
reflecting a PCA biplot
...;] <- -1*(fish.spp[,"PC1"])
> graph <- plot(fish.pca,display=c("sites","species"),type="n",scaling=3) #
how do I get the plot to draw up the blank display based on the reversed
site and species scores?
Any help appreciated.
cheers
Andy
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2011 Feb 08
1
which multivariate regression?
...EVs very low.
Any ideas??? I have lastly used Primer to analyze the response variable
in response to each EV individually. That works well but limits my
conclusions and doesn't allow me to account for variation in one of the EVs
affecting others. I appreciate any help I can get,
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2011 Oct 17
1
plotting issues with PCA
...t
get the lines to colour code the same way as the points did
> ordiellipse(graph,site.codings,kind="sd",conf=0.90,draw="polygon")
I see there is a command called show.groups but I cant work out how to use
it to access the plotcolor file.
Any help appreciated.
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2010 Oct 25
0
penalized regression analysis
...alty = 4944.889 at lambda1 = 356.0856
L2 penalty = 234.7781 at lambda2 = 3.458605
> coefficients (fitfinal)
(Intercept) BC POC EXP FI
4.685739e+01 2.074521e-01 1.079459e-01 -1.373058e-05 -2.295339e+00
cheers
Andy
--
Andrew Halford Ph.D
Associate Research Scientist
Marine Laboratory
University of Guam
Ph: +1 671 734 2948
[[alternative HTML version deleted]]
2012 Dec 07
0
loop for calculating 1-se in rpart
...control=rpart.control(minsplit=10,cp=0.01,xval=10));x=printcp(fit1);x[which.min(x[,"xerror"]),"nsplit"]})
> hist(cp50,main="optimal splits for tree",xlab= "no. of optimal tree
splits", ylab= "frequency")
Any help appreciated.
Andy
--
Andrew Halford Ph.D
Adjunct Research Scientist
University of Guam & Curtin University
Ph: +61 (0) 468 419 473
[[alternative HTML version deleted]]
2010 Oct 15
0
nomianl response model
...at allianz.com.au)
116. Re: drilling down data on charts
(sachinthaka.abeywardana at allianz.com.au)
117. Re: merging and working with BIG data sets. Is sqldf the
best way?? (Gabor Grothendieck)
118. Re: Poisson Regression (David Winsemius)
119. Re: repeating an analysis (Andrew Halford)
120. Re: Poisson Regression (Bill.Venables at csiro.au)
121. Re: Poisson Regression (Charles C. Berry)
122. Re: compare histograms (Michael Bedward)
123. Re: Matrix subscripting to wrap around from end to start of
row (Dennis Murphy)
124. Re: nnet help (Raji)
125. Re: Loop in col...
2008 Mar 20
0
Get list of users in one call
Hello,
I am working on an external/iframe application and am looking for a good way
to display fb info (pic, name) for a set of users. Since I''m not an fbml
app, I can''t use any of the fb_ helpers to access this, and without
instanciating a user for each and making multiple calls, I don''t see a
convienient way of doing this.
I am new to facebooker, but have used