Antonio Piccolboni piccolboni.info> writes:
> Hi,
> I was wondering if there is anything more efficient than split to do the
> kind of conversion in the subject. If I create a data frame as in
>
> system.time({fd = data.frame(x=1:2000, y = rnorm(2000), id = paste("x",
> 1:2000, sep =""))})
>
On 01/05/2012 00:28, Antonio Piccolboni wrote:
Hi,
I was wondering if there is anything more efficient than split to do the
kind of conversion in the subject. If I create a data frame as in
system.time({fd = data.frame(x=1:2000, y = rnorm(2000), id = paste("x",
1:2000, sep =""))})
user syst
This is not a problem at all. The log likelihood function is a function of the
model parameters and the data, but it is defined up to an additive arbitrary
constant, i.e. L(\theta) and L(\theta) + k are completely equivalent, for any
k. This does not affect model comparisons or hypothesis tests
It seems like people need to hear more context, happy to provide it. I am
implementing a serialization format (typedbytes, HADOOP-1722 if people want
the gory details) to make R and Hadoop interoperate better (RHadoop
project, package rmr). It is a row first format and it's already
implemented as a
Ok, it seems that R's AIC and BIC functions warn about different constants,
so that's probably enough. The constants are not irrelevant though, if you
compute the log-likelihood of one model using StructTS, and then fit
alternative model using other functions such as arima(), which do take
account
On May 1, 2012, at 1:26 PM, Antonio Piccolboni wrote:
> It seems like people need to hear more context, happy to provide it. I am
> implementing a serialization format (typedbytes, HADOOP-1722 if people want
> the gory details) to make R and Hadoop interoperate better (RHadoop
> project, package
On 29/04/12 13:50, Duncan Murdoch wrote:
On 12-04-29 3:30 AM, Philippe Grosjean wrote:
> Hello,
>
> ?delayedAssign presents substitute() as a way to look at the expression
> in the promise. However,
>
> msg<- "old"
> delayedAssign("x", msg)
> msg<- "new!"
> x #- new!
> substitute(x) #-
On 12-05-01 4:21 PM, Philippe Grosjean wrote:
On 29/04/12 13:50, Duncan Murdoch wrote:
On 12-04-29 3:30 AM, Philippe Grosjean wrote:
> Hello,
>
> ?delayedAssign presents substitute() as a way to look at the expression
> in the promise. However,
>
> msg<- "old"
> delayedAssign(
On Tue, May 1, 2012 at 11:29 AM, Simon Urbanek
wrote:
>
> On May 1, 2012, at 1:26 PM, Antonio Piccolboni
> wrote:
>
> > It seems like people need to hear more context, happy to provide it. I am
> > implementing a serialization format (typedbytes, HADOOP-1722 if people
> want
> > the gory details)
