Wednesday, December 2, 2009

Milo left this comment...

Depends on your point of view. From the tree's fixed position point of view, both are going round the tree; neither is going round the other. From the squirrel's point of view -- always facing toward the center of the tree as he moves around the tree-- the man is always straight staight-ahead: straight through the tree and is not moving around the squirrel. From the squirrel's point of view -- always facing in same direction as he moves around the tree, the man is going round the squirrel.

PS. Your definition of confounding seems a bit off. Unless a confounder is associated with at least two elements in an association, it can't influence the association.

Here is my response to Milo's comments...

Milo - I am amazed someone is actually reads this blog besides myself. Your answer to my challenge is definitely well thought out and makes it seem like I thought of a very clever questions. The last part of your answer concluding that the man is going around the squirrel because the squirrel is always facing the same direction - well, I must confess that answer confounds even my mind, and that is hard to do. So thus I must give you credit for answing this correcly because I am unable to devise a logical response to counteract it.

Now about my defition of confounding - I think you are just trying to give me a hard time with that one. I see no reason why there would need to be more than one other factor besides the confounder in an association in order for the counfounder to influence the association.

For exammple, take the relationship between shoe size and mathematic ability in students Grades K-8 in a school where all the students are given the same test. We would find that is a very high correlation between shoe size and test scores. But in fact the shoe size has no effect on the test scores, it is confounded by age. We would find that if we took only kids the same age and then correlated their shoe sizes with their test scores, no correlation would be found - identifying the confound of shoe size with age in influencing test scores. So here all you need is the one other factor, age, the true factor associated with test scores, to exist in order for there to be a confounding factor shoe size, a false association with test scores.

Wednesday, November 4, 2009


Friday, October 23, 2009

Very Interesting...

Man pleads guilty to DWI in motorized La-Z-Boy

AP – A motorized La-Z-Boy chair driven by Dennis Anderson of Proctor was operating when he hit a parked vehicle … Thu Oct 22, 9:17 pm ET

DULUTH, Minn. – A Minnesota man has pleaded guilty to driving his motorized La-Z-Boy chair while drunk. A criminal complaint says 62-year-old Dennis LeRoy Anderson told police he left a bar in the northern Minnesota town of Proctor on his chair after drinking eight or nine beers.

Prosecutors say Anderson's blood alcohol content was 0.29, more than three times the legal limit, when he crashed into a parked vehicle in August 2008. He was not seriously injured.

Police said the chair was powered by a converted lawnmower and had a stereo and cup holders.

Sixth Judicial District Judge Heather Sweetland stayed 180 days of jail time Monday and ordered two years of probation for Anderson. His attorney, David Keegan, did not immediately return a call for comment.


Information from: Duluth News Tribune,

Monday, August 24, 2009

Where Was I In '86? Where Were You?

I changed my look a little in '86. What do you think?

Tuesday, July 28, 2009

'84 Rocks! Where Were You?

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Sunday, July 26, 2009

The Confounding Factor Challenge

A man is walking around a tree. A squirrel is climbing around the trunk of the tree, and is always on the opposite side of the man. Is the man walking around the squirrel?

Feel free to leave your solution in the comment area.

I warn you though, I'm pretty clever so do not feel bad when you find out your answer is wrong. Oh, and the owner of the blog is always right. It is a unspoken blog rule. I am just jesting. I do not know the answer but I am going to ponder the riddle and post my solution in a few days.

Friday, July 10, 2009

Just a reminder

You don't have to

like me to