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ConnectBot - Open-source Secure Shell (SSH) client for Android

08/12/2010 16:58

 ConnectBot is a powerful open-source Secure Shell (SSH) client. It can manage simultaneous SSH sessions, create secure tunnels, and copy/paste between other applications.


This client allows you to connect to Secure Shell servers that typically run on UNIX-based servers.

What is Microarray Analysis?

08/12/2010 13:45

 Microarray technology allows biologists to monitor genome-wide patterns of

gene expression in a high-throughput fashion. Applications of microarrays
have resulted in generating large volumes of gene expression data with several
levels of experimental data complexity. For example, a “simple” experiment
involving a 10,000-gene microarray with samples collected at five time points
for five treatments with three replicates can create a data set with 0.75 million
data points! Historically, hierarchical clustering was the first clustering
method applied to the problem of finding similar gene expression patterns
in microarray data. Since then many different clustering methods have been
used, such as k-means, a self-organizing map, a support vector machine,
association rules, and neural networks. Several commercial software packages,
e.g., GeneSpring or Spotfire, offer the use of these algorithms for microarray
analysis.
Today, microarray analysis is far beyond clustering. By incorporating
a priori biological knowledge, microarray analysis can become a powerful
method for modeling a biological system at the molecular level. For example,
combining sequence analysis methods, one can identify common promoter
motifs from the clusters of coexpressed genes in microarray data using various
clustering methods. Furthermore, any correlation among gene expression
profiles can be modeled by artificial neural networks and can hopefully
reverse-engineer the underlying genetic network in a cell.

R resources on the Web

03/09/2010 16:02

 

Here are some suggestions for the best on-line resources for information about R.

The R Project homepage. Look here for official news from the R Project, plus links to documentation, mailing lists, the official R FAQs, and more.

StackOverflow. Got a question about R? Search for questions tagged with "r" and you'll probably find your question already answered. If not, ask away.

R bloggers. For a steady stream of news, tips and articles related to R follow this blog aggregator for posts from dozens of R bloggers, including the team from Revolution Analytics.

The Video Rchive. Watch recordings of speakers at R user group meetings and conferences talk about various aspects of using R.

#rstats on Twitter. To listen in on (or contribute to) an information-rich conversation about R 140 characters at a time, search for the #rstats hastag.

CRAN Task Views. The list of 2000+ add-on packages for R can be daunting, but these Task Views list the most important ones in domain-specific areas as diverse as Finance, Clinical Trials, and Machine Learning.

Crantastic.org: On the other hand, if you're looking for a specific page, you can search by keyword at this interactive directory of all R packages. You can also log in and rate and comment on packages.


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