Displaying 20 results from an estimated 70 matches similar to: "using lme and 'by' function to extract the co-efficients by individuals"
2005 Aug 12
1
help on cross hedge optimal hedge variance ratio
Hi everyone
I am trying to estimate the optimal hedge variance ratio for cross
hedging two commodities. the price levels are used (compared to price
change and % price change) and used the OLS with dummy variable for
estimating the co-efficients. the equation looks like this
Y = B + B1*D1 + B2*X + B3*(X*D1)
Where Y = Daily Cash market price
D1 = Dummy variable taking value 1 for period Oct-Mar
2007 Sep 22
2
SPEEX in a DSPIC - optimisation of iir_mem16() for speed - can it be 16 bit ?
Dear Sirs,
I would be interested to hear your views on whether SPEEX could be made to
run fast on a DSPIC33 by the following strategy:
Make iir_mem16() (for example) purely 16 bit by restricting the number of
bits in the signal to say 10 using SATURATE and then making the LPC
co-efficients just 6 bits.
At present (with standard code) the encode function is taking about 140ms
which is seven
2011 Apr 01
1
principal components
HI all,
I am trying to compute the EOF of a matrix using prcomp but unable to get
the expansion co-efficients.
is it possible using prcomp or are there any other methods
thanks
nuncio
--
Nuncio.M
Research Scientist
National Center for Antarctic and Ocean research
Head land Sada
Vasco da Gamma
Goa-403804
[[alternative HTML version deleted]]
2009 Mar 26
1
Extreme AIC in glm(), perfect separation, svm() tuning
Dear List,
With regard to the question I previously raised, here is the result I
obtained right now, brglm() does help, but there are two situations:
1) Classifiers with extremely high AIC (over 200), no perfect separation,
coefficients converge. in this case, using brglm() does help! It stabilize
the AIC, and the classification power is better.
Code and output: (need to install package:
2010 Jul 01
0
Cholmod warning when fitting a poisson GLMM
Hi,
I am getting a warning message when I am fitting a generalized mixed model (mod_2) and I don't understand why because when I add just an interaction factor the model works perfectly (mod_1).
Does anyone know what it happpens ?
Thanks,
Aïda
> mod_1<-lmer(sur15~soeviv15_4plus+frviv15_4plus+frat_15death+dad_class_new+soeviv15_4plus:dad_class_new +frviv15_4plus:dad_class_new+
2011 Jul 01
3
multiple moderated regression steps
hi,
?m studying moderated effects of percieved social support and justice world
belief on relationship between stress coping strategies and depression
level. ? haver never run this analysis before soi ? want to check my steps
whether correct or not.
first ? run regression
in step 1
centered independent variables and centered moderators
in step2
two way interactions
instep 3
three way
2008 Mar 25
1
(no subject)
I have a problem, would really appreciate if anyone could help me. I am
trying to use bootstrap to resample a dataframe n then use that sample of
dataframe to calcuate parameter estimates using betabinomial model. I am
kind of lost coz the bootstrap function requires us to give statistic (A
function which when applied to data returns a vector containing the
statistic(s) of
2008 Jul 07
5
question on lm or glm matrix of coeficients X test data terms
Hi,
is there an easy way to get the calculated weights in a regression equation?
for e.g.
if my model has 2 variables 1 and 2 with coefficient .05 and .6
how can I get the computed values for a test dataset for each coefficient?
data
var1,var2
10,100
so I want to get .5, 60 back in a vector. This is a one row example but I would want to get a matrix of multiplied out coefficients
2003 Sep 22
1
Updating a linear model
My google search for Plackett's Algorithm didn't return too much except that
Plackett's algorithm appears to be useful in Control Theory - it is
elaborated as "Plackett's algorithm for on-line recursive least squares
estimation". Sounds something like what I want.
I am looking at developing a user modelling type app (new data points coming
in and wanting to dynamically
2011 Feb 07
1
Four paramete logistics.
Hi,
I have to do a four point logistics for a dataset. All I have is the
absorbance value for different proteins and need to get the four Point
values. I have no idea where to start.
Any suggestions would be much helpful.
Thanks
Ramya
--
View this message in context: http://r.789695.n4.nabble.com/Four-paramete-logistics-tp3265251p3265251.html
Sent from the R help mailing list archive at
2010 Feb 24
1
how to label individuals with FactoMiner ?
Dear all,
i'm trying to label specific individuals (supplementary ones) after a PCA with the FactoMiner package. There is not much details (possibilities?) in the R-help of the plot.pca function. There is indeed a "label" parameter but i could only manage to label the supplementary individuals with there "row.names" (i.e. label="indiv.sup") and not with the
2009 Nov 13
0
Rarefaction Curve by Individuals not Sites - vegan (specaccum)
Hi List,
I’m using the vegan function specaccum to produce a rarefaction curve. In
the function’s help it says: “Function ‘specaccum’ finds species
accumulation curves or the number of species for a certain number of sampled
sites or individuals”. Well, I would like to finds this curve for
individuals, but when I compute it the function (using the ‘rarefaction’
method) gives me Sites, Richness
2011 Apr 20
1
Extrapolating data points for individuals who lack them
Hi,
We have an experiment where individuals responses were measured over 5 days. Some responses were not obtained because we only allowed individuals to respond within a limited time-frame. These individuals are given the maximum response time as they did not respond, yet we feel they may have done if given time (and by looking at the rest of their responses over time, the non-response days stand
2007 Jan 21
1
identify selected substances across individuals
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2012 Oct 30
0
lapply and kernelUD (adehabitatHR package): Home Range kernel estimation for a list of individuals
Dear R experts,
I'm using the adehabitatHR package in order to perform a kernel analysis and
estimate the home range of my input data (GPS relocations of 42
individuals).
I've done the analysis for one of the individuals and it worked perfectly
(see code below).
But now I'm trying to use a list and call the function lapply to do the same
thing through all the 42 individuals (also see
2019 Nov 01
2
Individuals interested in VESA memberships?
Hi! Recently I've been working with the rest of the X.Org board to try to get
X.org access to VESA memberships so that contributors that don't have an
employer who is able/willing to join VESA can potentially get access to the
various benefits of a VESA membership, such as access to DisplayPort
specifications. Since I need to gather a list of interested X.org members, I'd
like to know
2012 Jul 17
1
Stats question: Comparison of the same individuals during two exposure times
Hi,
I'm hoping that someone will be able to help. I would like to compare how
covariates associate with the risk of a binary outcome during two periods.
Period 1 will be non-exposure to a treatment and period 2 will be exposure
to a treatment. The same individuals will be examined in each group but I
want to be able to compare the association of certain covariates between the
two groups to
2011 Mar 11
2
insertion of a row between individuals
Can someone help with a fairly simple task?
I have a data set where I would like to insert a 0 time event between
individuals:
what I have:
VAR DATE TIME CONC COVAR
1 NOV2 0.25 10 group1
1 NOV2 0.5 20 group1
1 NOV2 1 5 group1
1 NOV2 2 1 group1
1 NOV2 3 0.1 group1
2 NOV2 0.25 10
2006 Mar 05
4
Help implementing a 43things-like ''activity'' measurement
I''m trying to implement something in my app akin to 43things'' main
page, where more active topics are bigger than the less active topics.
The difference in my app is that I''m building a business-oriented app
and want to have a list of clients, where clients with recent activity
are larger than others.
My perhaps too-clever way of going about this is by feeding each job
2010 Mar 14
3
CRAN (and crantastic) updates this week
CRAN (and crantastic) updates this week
New packages
------------
* apcluster (1.0.1)
Ulrich Bodenhofer
http://crantastic.org/packages/apcluster
The apcluster package implements Frey's and Dueck's Affinity
Propagation clustering in R. The algorithms are analogous to the
Matlab code published by Frey and Dueck.
* BioPhysConnectoR (1.6-1)
Franziska Hoffgaard