2443 search results for "Twitter"

A slice of infinity

July 27, 2011
By
A slice of infinity

Peng Yu sent me an email about the conditions for convergence of a Gibbs sampler: The following statement mentions convergence. But I’m not familiar what the regularity condition is. “But it is necessary to have a finite probability of moving away from the current state at all times in order to satisfy the regularity conditions on which

Read more »

The Stats Clinic

July 27, 2011
By
The Stats Clinic

Here at HSL we have a lot of smart kinda-numerate people who have access to a lot of data. On a bad day, kinda-numerate includes myself, but in general I’m talking about scientists who have have done an introductory stats course, but not much else. When all you have is a t-test, suddenly everything looks

Read more »

Bayesian Core and loose logs

July 26, 2011
By
Bayesian Core and loose logs

Jean-Michel (aka Jean-Claude!) Marin came for a few days so that we could make late progress on the revision of our book Bayesian Core towards an Use R! version. In one of the R programs in the mixture chapter, we were getting improbable answers, until we found an R mistake in the shape of which

Read more »

Scatterplot matrices in R

July 25, 2011
By
Scatterplot matrices in R

I just discovered a handy function in R to produce a scatterplot matrix of selected variables in a dataset. The base graphics function is pairs(). Producing these plots can be helpful in exploring your data, especially using the second method below.Try...

Read more »

Nick Stoke’s Improvements

July 25, 2011
By
Nick Stoke’s Improvements

Fast on the heels of getting RomanM’s code up and running in RghcnV3,  Nick Stokes whipped out a version of his approach which he covered on his blog here: We exchanged code and few mails thrashing through details and I’m now in a position to start the integration work of his approach into Rghcnv3. In

Read more »

Ternary sorting

July 24, 2011
By
Ternary sorting

The last Le Monde puzzle made me wonder about the ternary version of the sorting algorithms, which all seem to be binary (compare x and y, then…). The problem is, given (only) a blackbox procedure that returns the relative order of three arbitrary numbers, how many steps are necessary to sort a series of n

Read more »

PC-Axis with R: pxR

PC-Axis with R: pxR

PC-Axis is a software family consisting of a number of programs for the Windows and Internet environment used to present statistical information. It is used by national and international institutions to publish statistical data. Programs in the PC-Axis family use a particular data file format (see the full PX-Axis data format description). Now the pxR

Read more »

Passing non-graphical parameters to graphical functions using …

July 23, 2011
By
Passing non-graphical parameters to graphical functions using …

Argument passing via ... is a great feature of the R language, allowing you to write wrappers around existing functions that do not need to list all the arguments of the wrapped function. ... is used extensively in S3 methods … Continue reading →

Read more »

RomanM’s Method

July 22, 2011
By
RomanM’s Method

I’ve succeeded in getting a version of RomanM and JeffId’s Thermal hammer working with version 1.3 of RghcnV3. This is going to be a long post because there is a lot of ground to cover. First, some errata, the “Globe” demo in V1.3 appears to have a missing line, looks like an editor bug, so

Read more »

Le Monde puzzle [#28]

July 22, 2011
By
Le Monde puzzle [#28]

The puzzle of last weekend in Le Monde was about finding the absolute rank of x9 when given the relative ranks of x1,….,x8 and the possibility to ask for relative ranks of three numbers at a time. In R terms, this means being able to use or yet being able to sort the first 8

Read more »