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Brian Whatcott

On Mon, 27 Oct 2008 14:29:11 GMT, (Richard
Casady) wrote:

On Sun, 26 Oct 2008 18:04:29 -0400, wrote:

On Sun, 26 Oct 2008 09:56:47 -0600, "Charles Momsen"
wrote:

"ray lunder" wrote in message
...
Looking for a used cruise equiped 30-40 foot sailboat for approx a us
buck per foot. Any ideas? Techniques? I've tried 38/48 north and
craigslist so far....

Total weight, of similar objects, varies with the cube of the length.
So a 54 foot boat would cost eight times as much as a 27. This might
even be pretty close for the hull and machinery, less so with the
electronics as you don't have to go bigger and better. The cheapest
GPS will replace a sextant as well as a pricey one.

Ten foot dingys don't generally cost ten grand, and no way you get a
54 foot boat for 54 big ones. There is a point in between where it is
a grand a foot, that is a mathmatical certainty.

Casady

This note was very like waving a red flag at a bull, or more nearly,
waving a line of cocaine at a rock guitarist.

I sampled price versus length from offers at SailboatTraderOnline,
for the names initialized by A thru G
(Allmand, Beneteau, Cal, Dufour, Endeavour,
Fountain, Grampian, Hunter)

...and planted the list of lengths versus boat bucks into NLREG
(a non linear regression tool.)

This came up with
Price in boat bucks = [ 0.115 times Length in feet ] cubed.

The fit is not particularly great (It explains 0.43 of the variance)
but it is plausible for a random sample of boats,
so for a
20 ft pay $12.2K
30 ft pay $41K
40 ft pay $97.3 K
50ft pay $190 K

Brian Whatcott Altus OK

************************************************** ********************

Title "Regression model: Price $K of sailboat versus length ft";
Variable Len; // hull length in ft
Variable Price; // Asking price
Parameter Price1; // fit price1
Parameter Price2; // fit price2
Function Price = ( price1 * Len ) ^ Price2 ;
plot;
Data;
31 17.5
31 21.5
34 145
29 13.9
50 109
37 79
27 10
34 19.9
35 62
39 49.9
40 216.4
37 125
42 139.9
30 55
32 14
33 34.5
29 75
30 10
31 64.7
45 334
30 13.5
30 30
******************************
/end