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See a the poll here by Gabriel Rossman at Code and Culture. I voted for R and ‘igraph’. If you use R you are getting access to all the other wonderful things that come with R. Using specialized package, like Pajek, UCINET etc requires constant going back and forth between ... [Read more...]

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In this post I reflect on the current state of the R blogosphere, and share my hopes for the future [Read more...]

I came across this blog post just now: The Next Big Thing, and of course these words caught my attention: [...] However, for me personally and for most users, both individual and organizational, the much greater cost of software is the time it takes to install it, maintain it, learn it ... [Read more...]

Major credit card issuing networks (including Visa, MasterCard, Discover, and American Express) allow simple credit card number validation using the Luhn Algorithm (also called the “modulus 10″ or “mod 10″ algorithm). The following code demonstrates an implementation in SAS. The code also validates the credit card number by length and by checking ... [Read more...]

In our department and various places on the Intertubes, SAS programmers set the HTML title tag (which sets the title in web browsers and on search engines) in ODS using the headtext option: ods html headtext="My great report" /* wrong! */ file="foo.html"; This may work in some situations, but ... [Read more...]

Coming from a background writing SQL code directly for “real” RDBMS (Microsoft SQL Server, MySQL, and SQLite), I was initially confused when SAS would give me the following ‘note’ for a simple summary PROC SQL query: 429 proc sql; 430 create table undel_monthly as 431 select 432 year(date) as year, 433 month(date) ... [Read more...]

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The situation: you have two datasets with a common variable, and you want to incorporate both into one large dataset containing all of the variables. This is called merging data, and it’s easy to do in any standard statistical package. In these examples, I assume that there is only ... [Read more...]