1st variable :  Origin  1- Alaskan   2- Canadian
2nd variable :  Gender  1- female    2- male

3rd variable :  X1 = diameter of rings for the first-year freshwater growth (hundredths of an inch)

4th variable :  X2 = diameter of rings for the first-year marine growth (hundredths of an inch)


                        DESCRIPTION:

The salmon fishery is a valuable resource for both the United States and Canada. 
Because it is a limited resource, it must be managed efficiently. Moreover, since more 
than one country is involved, problems must be solved equitably. That is, Alaskan commercial
 fishermen cannot catch too many Canadian salmon and vice versa.

These fish have a remarkable life cycle. They are born in freshwater streams and after
 a year or two swim into the ocean. After a couple of years in salt water, they return 
to their place of birth to spawn and die. At the time they are about to return as mature fish, 
they are harvested while still in the ocean. To help regulate catches, samples of fish
 taken during the harvest must be identified as coming from Alaskan or Canadian Waters. 
The fish carry some information about their birthplace in the growth rings on their scales.
 Tipically, the rings associated with freshwater growth are smaller for the Alaskan-born 
than for the Canadian-born salmon.