Displaying 12 results from an estimated 12 matches for "esimates".
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estimates
2011 Feb 10
2
Getting p-value from summary output
I can get this summary of a model that I am running:
summary(myprobit)
Call:
glm(formula = Response_Slot ~ trial_no, family = binomial(link = "probit"),
data = neg_data, na.action = na.pass)
Deviance Residuals:
Min 1Q Median 3Q Max
-0.9528 -0.8934 -0.8418 1.4420 1.6026
Coefficients:
Estimate Std. Error z value Pr(>|z|)
2004 Dec 09
1
How can I estimate parameters of probability distributions?
Hi list,
I have a group of data. It looks like they follow a exponential
distribution. In R, how can I esimate lamda, that is the rate in pexp,
of the distribution and can I use Kolmogorov-Smirnov for hypothesis
testing in such a situation? I have read the "8.2 Examing the
distribution of a set of data" of "An Introduction to R" but I did not
find any clues on this issue.
2006 Sep 11
1
estimating state space with exogenous input in measurement eq.
Anyone know how to esimate parameters in the system:
x[k]=Ax[k-1]+ B + Gv[k-1]
y[k]=x[k]+Du[k]+Hw[k]
a system with exogenous u[k] in the measurement eq., v,w are iid, both eq. are gaussian.
Thanks,
Oyvind
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2008 Jun 04
1
linear model with the repeated data type~
...subset=(id==1))
but ,you can see the variable "id" is quite irregular,they are not arranaged
in order and many number missing,if I write a loop by using "for",it will
give me a lot "NA",
and for sure ,I dont want to type id=## for about 500 times
so,how to get all the esimates for each id,and exclude the NA,then record
those estimate in one table?
great thanks ~~
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2011 Apr 18
1
time dependent hazard ratios
Hi, I am new to time-dependent Cox model to estimate time dependent hazard
ratios. Let me use aml dataset from survival package:
> aml3<-survSplit(aml2,cut=c(5,10,20),end="time",start="start",
event="status",episode="i")
If I want to esimate hazard ratio for each of the time intervals 0-5, 5-10,
10-20 and >=20, would the following calculate
2012 Oct 28
1
Why are coefficient estimates using ML and REML are different in lme?
Hi, All,
My data collection is from 4 regions (a, b, c, d). Within each region, it has 2 or 3 units. Within each unit, it has measurement from about 25 sample site. I was trying to use lme function to discribe relationship between y and a few covariates. Both y and covariates were measured at the sample site level. My question is when I use exactlly the same model but choose different estimation
2005 Aug 06
1
qq.loglogistic
Hi,
is there any similar function in R to S function qq.loglogistic, which
produces a Q-Q plot?
Thanks a lot
Pete
2008 Oct 08
0
genoud nonlinear least squares optimisation
Hello,
I am trying to optimise a nonlinear model to derive 'best-fit' parameter
esimates using the genoud function. I have been using the genetic algorithm
- gafit - in order to do this, but I am getting parameter estimates that do
not always reach the global minimum. I am very keen to apply genoud to
optimising this model to see if my results will improve, and also out of
personal int...
2013 Apr 04
0
Std. error normalmixEM using boot.se
....040177
sigma1hat=0.01222
sigma2hat=0.00325
My problem is - and thats why I feel uncomfortable about relying on the
values- that the ouput of boot.se(normalmix) varies quite strong. So
without chanigng the code an drerun it (with the same normalmix, so
normalmix is not rerun again) I get different esimates of the standard
errors. I increased the default value for B from 100 to 1000. In the manual
there is nothing said about any other randomness. So where does it com
from? What should I do now?
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2008 Dec 08
1
residual standard error in rlm (MASS package)
Hi,
I would appreciate of someone could explain how the residual standard
error is computed for rlm models (MASS package). Usually, one would
expect to get the residual standard error by
> sqrt(sum((y-fitted(fm))^2)/(n-2))
where y is the response, fm a linear model with an intercept and slope
for x and n the number of observations. This does not seem to work for
rlm models and I am wondering
2010 Feb 15
4
density estimates for fixed points
Problem:
Based on a n x 2 data matrix i want a kernel estimate of the bivariate
density. However, i also wish to specify wich points the density should be
calculated at.
I can offcourse just write the full kernel density estimate as a R-code, but
surely there must already exist some package for this operation?
The package density(), seems to create a new matrix (depending on n), where
the
2011 Dec 28
2
Gale-Shapley Algorithm for R
Dear R-helpers,
I'm not a speciallist in writing complex functions, and the function still
very rusty (any kind of suggestions are very welcome). I want to implement
Gale-Shapley algorithm for R Language. It is based on
http://www.jstor.org/stable/10.2307/2312726 Gale and Shapley (1962) , and it
has evolved to