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The Voyage of Spectacle Type I Error

The Voyage

Spectacles

Andy and Melissa are sailing around the world on their 48-foot sailboat, Spectacle.

The Position

Bali, Indonesia

The Pictures

The Voyage of Spectacle

Type I Error

For any of you who had the pleasure of taking Statistics 150 at Mizzou or its equivalent elsewhere, you might recall the concept of Type I and Type II errors.

Basically, a Type II error is, in boating as in most walks of life, the more common mistake:  underinclusivity, the failure to include relevant data, or, if you will, the failure to recognize a particular extant problem — a false negative.

A Type I error is a mistake far less common in boating:  overinclusivity, the inclusion of irrelevant/erroneous data, or, if you will, identifying as extant a problem which does not in fact exist — a false positive.

Let’s make this simple –

Not knowing that the Japanese were going to bomb Pearl Harbor — Type II error.

Erroneously assuming Iraq had weapons of mass destruction — Type I error.

OK, even more simple.

When the pregnancy test says you aren’t pregnant and you actually are – Type II error.
When the pregnancy test says you are pregnant and you really aren’t – Type I error.

See the difference?

Not being the most experienced sailors, we commit Type II errors all the time.  The Tale of the Twin Fiascoes was basically one Type II error after another – not filling up the gas tank, thinking we had a handheld VHF but not actually having one, not turning off the electronics once we were out of fuel, etc., etc., etc.

Well, I’ve finally committed my first major Type I error.  And it was a doozy…

For about the last two weeks, I’ve been convinced that our batteries were, for whatever reason, failing adequately to retain charge.  Following test after test, the reading of endless manuals (probably could have done some more of that earlier) and even the hiring of a largely clueless electrician, I have now diagnosed the situation:  there is nothing now wrong, nor has there recently been anything wrong, with our batteries.  Instead, there is something wrong with my powers of diagnosis.

This episode would be at bit more humorous if it weren’t so badly timed.  Having improbably cleared every hurdle in our mad scramble to meet our deadline, we actually found ourselves all set – the boat was all ready to go to the Galapagos and we could have left on time in ideal conditions (the weather was absolutely perfect), saved ourselves a couple of thousand dollars in airfare and attendant travel hassles and had an extra two weeks in the South Pacific.  So, yeah, um …


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