Monthly Archives: June 2010

Example 7.42: Testing the proportionality assumption

June 21, 2010
By
Example 7.42: Testing the proportionality assumption

In addition to the non-parametric tools discussed in recent entries, it's common to use proportional hazards regression, (section 4.3.1) also called Cox regression, in evaluating survival data.It's important in such models to test the proportionality a...

Read more »

A quetion

June 21, 2010
By
A quetion

I posted a question to the R-Mixed-Model mailing list but have not had any responses yet:--------------------------------------------------------------------------------------- Dear All,I wonder if anybody has tried to make glmmBUGS work with JAGS. Mya...

Read more »

The police records for 2009 are out.

June 20, 2010
By
The police records for 2009 are out.

The 2009 homicide numbers collected by the SNSP (National System of Public Security) are finally out, you can download the data from the ICESI, which is a civic institution not affiliated with the government. If you remember, one of the conclusio...

Read more »

The police records for 2009 are out.

June 20, 2010
By
The police records for 2009 are out.

The 2009 homicide numbers collected by the SNSP (National System of Public Security) are finally out, you can download the data from the ICESI, which is a civic institution not affiliated with the government. If you remember, one of the conclusio...

Read more »

Here’s the distribution of the first million digits of the…

June 20, 2010
By
Here’s the distribution of the first million digits of the…

Here’s the distribution of the first million digits of the square root of two’s decimal expansion. Number of digits | is:   0's |  99 818  1's |  98 926  2's | 100 442  3's | 100 191  4's | 100 031  5's | 100 059  6's |  99 885  ...

Read more »

QSPR modeling with signatures

June 20, 2010
By
QSPR modeling with signatures

I had to dig deep to find posts on QSAR modeling. There are quite a few on QSAR in Bioclipse, but that focuses on the descriptor calculation. In a quick scan, I could only spot two modeling posts:The CDK/Metabolomics/Chemometrics Unconference resultsWh...

Read more »

R-INLA package

June 19, 2010
By
R-INLA package

Another R package for mixed effect modeling. Looks promising.

Read more »

Estimating Probability of Drawdown

June 19, 2010
By
Estimating Probability of Drawdown

I've shown several examples of how to use LSPM's probDrawdown function as a constraint when optimizing a leverage space portfolio.  Those posts implicitly assume the probDrawdown function produces an accurate estimate of actual drawdo...

Read more »

More powerful iconv in R

June 19, 2010
By

The R function iconv converts between character string encodings, for example, from the locale dependent encoding to UTF-8: > iconv("foo", to="UTF-8") [1] "foo" However, R has long-running trouble with embedded null characters ('') in strings. Hence, if we try to convert to an encoding that permits embedded null characters, iconv will fail: > iconv("foo", to="UTF-16")

Read more »

What I need to know…

June 19, 2010
By

is maps and geographical data representation in R. In case you’re curious too this is a good study material from R-Bloggers : maps ; geographical ; spatial Ok. This could be a tweet rather than a post…

Read more »