Who are you and why should I care?
My name is Kevin Moreau (you know—the guy whose name is in the URL of this site). As to why or whether you should care, you can read more about me here. But basically, I know a little about a lot of things, and a lot about things of little importance, and I thought I’d unburden myself of some of that knowledge on this site.
Why is this page called Infrequently Asked Questions?
Because really, how often do Frequently Asked Questions actually get, you know, asked? I’m just keeping it real.
What is your favorite color?
See? No one ever asks me that.
Are you on Facebook?
Not at present.
What about Twitter?
Yes. Follow me @KFMoreau.
Why are you on Twitter but not Facebook?
I don’t really know. I’ve just never woken up and said, “You know what? I really want to join Facebook today.”
What, you got something against Facebook? Are you too good for the rest of us who might want to friend you on Facebook?
Not particularly. And no. Why are you so hot for me to join Facebook? I don’t even know you.
I’ll ask the questions, if you don’t mind.
Why are you apologizing?
Because I’m here to answer your questions, not ask them. Forget I said anything.
When the covariance matrix of a multivariate random variable is not known and has to be estimated, how then does one approximate the actual covariance matrix on the basis of a sample from the multivariate distribution?
You heard me.
Is that a real question?
Don’t answer a question with a question. Just answer it!
You don’t have to shout, you know.
Answer it now! Please.
(Sigh.) Fine. Simple cases, where observations are complete, can be dealt with by using the sample covariance matrix (SCM), an unbiased and efficient estimator of the covariance matrix if the space of covariance matrices is viewed as an extrinsic convex cone in Rp×p; however, measured using the intrinsic geometry of positive-definite matrices, the SCM is a biased and inefficient estimator.
What are some random things you like?
Action movies and non-action movies. “The Soup.” The iPhone. Warren Ellis, Grant Morrison and Ed Brubaker. Rush, Matthew Ryan, Too Much Joy, DMX, Big Boi, Big Country, the Drive-By Truckers, the Replacements, Steve Earle and Iron Maiden. The Atlanta Braves and the New Orleans Saints. James Ellroy, John Irving, John Connolly, Robert Crais, Lawrence Block, Andrew Vachss, Joe R. Lansdale and James Lee Burke. Blondes, brunettes and redheads. “American Splendor” (the movie and the comic book). Science fiction. Visual art grounded in popular culture. The Weakerthans’ “Reconstruction Site,” Idlewild’s “100 Broken Windows” and John Hiatt’s “Perfectly Good Guitar.” “Casablanca” and old “Flash Gordon” serials. Red meat, pizza, Belgian waffles, Ritz crackers and chocolate chocolate chip ice cream.
Any pet peeves?
One, when I was a kid, but it got sick and we had to take it to the vet to get put down.
Do you really think you’re funny?
Okay, okay. People who talk in movie theaters. And men who wear sandals in public.
What are your vices?
The iPhone Scrabble app. Attention deficit disorder. Being a wiseguy. Being suspicious, distrustful and misanthropic. Also, trusting too much.
How about your favorite color?
Seriously, it’s really weird that you’re not on Facebook. I’m just sayin’.
We’re done here.
(Editor’s note: Okay, I finally broke down and joined Facebook. Find me under Kevin Forest Moreau. And if you’ll be my friend, I’ll be yours, too!)