I'm trying to run Xpath queries using etree, but I can't seem to figure out the Xpath syntax. Here's a (sanitized) section of my XML document. 1) Query using XML based on some value like the 'id' or ...

Recall that R is a statistical programming language—a language designed to do things like t-tests, regression, and so on. The core of R was developed during the 1970s and since then, many libraries ...