Carl Love

## 27229 Reputation

11 years, 346 days
Himself
Wayland, Massachusetts, United States
My name was formerly Carl Devore.

## Maple in Amsterdam?...

I'll be vacationing in Amsterdam May 1-11. I was wondering if there are any Maple-related activities or institutions there that I might visit. I believe that the Netherlands has somewhat of a national drive toward the use of computer algebra in education, much more so than the United States. Can anyone here confirm that? And if that's true, is Maple a big part of it?

## Statistics:-LinearFit: how to get R^2 an...

In doing multiple linear regression with Statistics:-LinearFit, how do I get or compute the values commonly called R^2 and R^2[adjusted], also known as the coefficient of determination? I know that residualsumofsquares is part of it. I also need the "total sum of squares" to compute R^2. And how do I modify that to get R^2[adjusted]? These things do not seem to be among the numerous output options to LinearFit. These values (R^2 and R^2[adjusted]) are typically part of the output of other statistics software when doing multiple regression.

I'd also like the p - values for the significance of the individual parameters and the p - value for the global utility---also things that are standardly reported by statistics software.

## When is `print/diff` used, and how do I ...

Both eval and showstat show that a procedure `print/diff` exists, but I am having trouble figuring out when the procedure is invoked. I expect it to be invoked---like any other `print/` procedure---when diff is output as an unevaluated function call. So I enter,

debug(`print/diff`);
diff(f(x), x\$2);

This does not produce any debug output. Why? Checking with lprint shows that the result does indeed contain diff as an unevaluated function call.

## Where is `PDEtools/declare`?...

Maple 17

Looking at the code of PDEtools:-declare, one sees that it does some brief initializing and then passes the job off to `PDEtools/declare`. I'd like to view this latter procedure, but I can't find it. It is not at the top level, nor is it an export or local of module PDEtools. So where is it?

## How can I get the Studentized Range (q) ...

With Statistics, how can I get/compute the Studentized Range distribution, commonly called the q distribution, which is used in Tukey's post-hoc Honestly Significant Difference (HSD) test (Wikipedia link)? Does this distribution exist in Statistics with a different name? Can I calculate it as some combination of distributions that do exist in Statistics? I know that it is closely related to Student's t distribution.

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