sorry, i ommited some important information.
this is a documentation question!
i meant to ask how to find out how R calculates the standard error and how
it differs between the two models
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I need to find out the difference between the way R calculates weighted
regression and standard regression.
I want to plot a 95% confidence interval around an estimte i got from least
squares regression.
I cant find he documentation for this
ive looked in
?stats
?lm
?predict.lm
?weights
?res
anyone?
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https://st
can you do Logistic regression in R, if so how do you do it and how do you
test the fit of a model?
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_
I got the usual regression output from a model i did in R.
Im looking for alternative test criteria that can be done in R which are not
in the standard lm output.
I need to:
a) asses the fit of a logistic regression model and of a linear regression
model
b) compare the fit of models against
Very good patrick, lol.
does anyone have any useful ideas
Patrick Burns wrote:
>
> DispersionMap wrote:
>>
>> What about validating forecasting results. I have 5 years of data and
>> have
>> been forecasting the following three years i.e. 2010 to 2012.
>
What about validating forecasting results. I have 5 years of data and have
been forecasting the following three years i.e. 2010 to 2012.
How can i check my forecast.
Why types of tests are out there that can be implemented in R??
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>
> HTH
> Stephan
>
> DispersionMap schrieb:
>>
>> I have some data that i ran a regression on and got the usual r output,
>> with
>> the a intercept and b coefficient for my independent variable.
>>
>> i want to forecast the number of futur
I have some data that i ran a regression on and got the usual r output, with
the a intercept and b coefficient for my independent variable.
i want to forecast the number of future events using these parameters.
What function / packages in R would you recommend to be used in good effect
for the
Im doing a plot where i look at clusters of data with circles indicating how
big the cluster is:
palette(rainbow(1000, end = 0.9))
symbols(data$lab, data$bak, circles = var21, main = "Circles Plot", fg =
"grey", bg = 1:1000)
As i have lots and lots of data points to plot i get alot of circles.
im using w7 ultimate
Peter Ehlers wrote:
>
> pkg:lattice is installed as part of the base R distribution.
> You don't need to install it.
>
> DispersionMap wrote:
>> Thanks, ill give them whirl...when i was installing the lattice package i
>> got
>> the
ould try density plots:
>> If dat is your dataframe, y is your numerical vector and
>> g is your factor,
>>
>> library(lattice)
>> trellis.device(height=9, width=7)
>> densityplot(~g|y, data=dat, plot.points=FALSE, layout=c(1,4))
>>
>> See ?densityplot
ld use jittered stripcharts.
> They're more informative than boxplots and much less subject to
> misinterpretation. One warning, I'm not fond of the default pch=0.
>
> -Peter Ehlers
>
> DispersionMap wrote:
>> What ways are there to plot categorical vs numerical data in
What ways are there to plot categorical vs numerical data in R.
I have two columns: one with categorical data in 5 categories a,b,c,d,e, and
a numerical column with integers between 1 and 100.
I have used a boxplot with a,b,c,d,e on the x-axis and an increasing
numerical scale on the y-axis. T
Is this book worth its dollar? If so, why?, if not, why not?
Cheers.
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Data Analysis and Graphics Using R - An Example-Based Approach
John Maindonald and John Braun
2nd edn, Cambridge University Press, January 2007
susan jacobs wrote:
>
> Hi,
>
> im working in R but honestly i don t know how to apply the formulas in my
> problem, can someone give some help?
;, "2006-10-09", "2007-02-12",
"2007-03-26", "2007-07-09", "2007-11-05", "2008-02-25", "2008-09-08",
"2009-08-10", "2008-09-15", "2009-06-08", "2006-05-15", "2007-07-02",
"
nstead.
>>
>> On Sun, Nov 29, 2009 at 8:44 PM, DispersionMap > > wrote:
>>>
>>> i have a column of dates in this format:
>>>
>>> data[,"Raised.Date"] <- as.Date(data[,"Raised.Date"], "%d/%m/%Y");
>>> dat
i have a column of dates in this format:
data[,"Raised.Date"] <- as.Date(data[,"Raised.Date"], "%d/%m/%Y");
data[1:10,"Raised.Date"]
[1] "2006-07-07" "2006-07-07" "2006-04-03" "2006-04-03" "2006-04-03"
"2006-04-03" "2006-04-03" "2006-04-03" "2006-04-03" "2006-04-03"
I can turn them into months
being updated or something like that.
When i type in http://old.nabble.com/ then click I get redirected to...
R http://n4.nabble.com/R-f789695.html ...??
David Winsemius wrote:
>
>
> On Nov 28, 2009, at 12:26 PM, DispersionMap wrote:
>
>>
>> Wha
im confused, everytime i try to get to the old forum i get redirected here
though???
i dont know why.
Sharpie wrote:
>
>
> DispersionMap wrote:
>>
>> Whats happening? everthings changing round here...plus alot less
>> posts/users..
>>
>
> R-Help is
Whats happening? everthings changing round here...plus alot less
posts/users..
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i had some great success with mosiacplots...
http://stat.ethz.ch/R-manual/R-patched/library/graphics/html/mosaicplot.html
http://stat.ethz.ch/R-manual/R-patched/library/graphics/html/mosaicplot.html
...does anyone know of any other hidden gems out there that allow you to
examine the relationshi
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