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One technique for multiple attribute decision making is to develop a
weighted matrix listing the criteria used for the decision compared to the objects being considered. We'll use three boats as an example, Boat Alpha, Boat Bravo, and Boat Charlie. We must first identify the criteria which are important to us. For this example, I've chosen: Looks, Speed, Cost, and Length First we will determine the relative value of each criterion as compared to each other. I'll let Looks have a 1.0 value. Then I have to ask myself, is speed more or less important than looks. Let's say speed is half again as important as looks, then speed would get a value of 1.5. Each of the criteria are so weighted. Cost may be twice as important as looks, so it would get weighted with a 2.0. Length isn't as important as looks, so it gets a 0.8 Now we have to weight each boat in terms of the criteria. We'll use a number from 1 to 10 to weight each. Alpha is pretty ugly. Charlie is gorgeous. Alpha is the fastest, but not quite as fast as I'd like. Charlie is a dog. Bravo is the least costly, with Alpha not far behind. Charlie is quite expensive. Length is easy. I want a long boat, and Bravo is the longest. Alpha is the shortest. Alpha Bravo Charlie Looks 4 6 10 Speed 8 5 3 Cost 7 9 2 Length 3 8 5 Now I apply the weight of the criteria to the score of each boat, and then get the total for each boat. Alpha Bravo Charlie Looks (1.0) 4 6 10 Speed(1.5) 6 7.5 4.5 Cost (2.0) 14 18 4 Length(0.8) 2.4 6.4 4.0 Totals 26.4 37.9 22.5 And the winner is Charlie! Of course, for an actual selection many more criteria would be involved. And, the technique can be much more specific by using pairwise comparisons for each of the criteria. I used a simple comparison of each criterion to speed, but it could be that comparing length to cost, length should not be less than half as important as cost. When done with a computer program, the results can be used to show 'consistency' (or lack thereof) in the weight of each criteria. This technique was used, and may still be, as a way to evaluate officers for selection to promotion or command positions in the Army. |
#2
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On Sep 9, 1:55*pm, John H wrote:
One technique for multiple attribute decision making is to develop a weighted matrix listing the criteria used for the decision compared to the objects being considered. We'll use three boats as an example, Boat Alpha, Boat Bravo, and Boat Charlie. We must first identify the criteria which are important to us. For this example, I've chosen: Looks, Speed, Cost, and Length First we will determine the relative value of each criterion as compared to each other. I'll let Looks have a 1.0 value. Then I have to ask myself, is speed more or less important than looks. Let's say speed is half again as important as looks, then speed would get a value of 1.5. Each of the criteria are so weighted. Cost may be twice as important as looks, so it would get weighted with a 2.0. Length isn't as important as looks, so it gets a 0.8 Now we have to weight each boat in terms of the criteria. We'll use a number from 1 to 10 to weight each. Alpha is pretty ugly. Charlie is gorgeous. Alpha is the fastest, but not quite as fast as I'd like. Charlie is a dog. Bravo is the least costly, with Alpha not far behind. Charlie is quite expensive. Length is easy. I want a long boat, and Bravo is the longest. Alpha is the shortest. * * * * * * * * * *Alpha * * * * * *Bravo * * * * * * *Charlie Looks * * * * * 4 * * * * * * * * * * 6 * * * * * * * * * * 10 Speed * * * * *8 * * * * * * * * * * 5 * * * * * * * * * * * 3 Cost * * * * * * 7 * * * * * * * * * * 9 * * * * * * * * * * * 2 Length * * * * 3 * * * * * * * * * * 8 * * * * * * * * * * * 5 Now I apply the weight of the criteria to the score of each boat, and then get the total for each boat. * * * * * * * * * * * * Alpha * * * * * * *Bravo * * * * * * Charlie Looks (1.0) * * * * 4 * * * * * * * * * * * *6 * * * * * * * * * 10 Speed(1.5) * * * * 6 * * * * * * * * * * * *7.5 * * * * * * * * *4.5 Cost * (2.0) * * * *14 * * * * * * * * * * *18 * * * * * * * * * *4 Length(0.8) * * * * *2.4 * * * * * * * * * 6.4 * * * * * * * * * 4.0 Totals * * * * * * * * 26.4 * * * * * * * * *37.9 * * * * * * * * 22.5 And the winner is Charlie! Of course, for an actual selection many more criteria would be involved. And, the technique can be much more specific by using pairwise comparisons for each of the criteria. I used a simple comparison of each criterion to speed, but it could be that comparing length to cost, length should not be less than half as important as cost. When done with a computer program, the results can be used to show 'consistency' (or lack thereof) in the weight of each criteria. This technique was used, and may still be, as a way to evaluate officers for selection to promotion or command positions in the Army. Lemme guess, you got promoted on looks versus speed, right?!!! |
#3
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#4
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#5
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#6
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#7
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On Tue, 09 Sep 2008 15:25:45 -0400, John H wrote:
Hey, when you're investing many thousands, spending a couple hours doing some analysis can pay off in a big way. It does take time, but only because of the thinking involved. Anything that encourages an assesment of your real needs and priorities is a good thing. When we went looking for our "retirement" boat we down rated speed since presumably we would have more time available for cruising. We put a high premium on redundancy/reliability because we had many prior experiences with plans being disrupted because of mechanical and electrical issues. Therefore we wanted a boat with twin engines, twin generators, dual nav/helm stations, etc. We also wanted a boat with good fuel range and water capacity so that we could make long passages to the boondocks and be able to stay there for a while. Then the admiral threw a curve ball into the mix. She wanted a boat big enough for grand children and their parents. Of course all of the boat brokers would ask how many grandchildren we had. The answer was, and is, zero - but no matter to the admiral. The extra cabins are useful for storage of course. And *that* is how you end up with a 50 footer that weighs about 40 tons fully loaded. :-) The redundant critical systems have paid off many times over, paticularly with the generators which get worked a lot. |
#8
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posted to rec.boats
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On Tue, 09 Sep 2008 15:49:18 -0400, Wayne.B
wrote: On Tue, 09 Sep 2008 15:25:45 -0400, John H wrote: Hey, when you're investing many thousands, spending a couple hours doing some analysis can pay off in a big way. It does take time, but only because of the thinking involved. Anything that encourages an assesment of your real needs and priorities is a good thing. When we went looking for our "retirement" boat we down rated speed since presumably we would have more time available for cruising. We put a high premium on redundancy/reliability because we had many prior experiences with plans being disrupted because of mechanical and electrical issues. Therefore we wanted a boat with twin engines, twin generators, dual nav/helm stations, etc. We also wanted a boat with good fuel range and water capacity so that we could make long passages to the boondocks and be able to stay there for a while. Then the admiral threw a curve ball into the mix. She wanted a boat big enough for grand children and their parents. Of course all of the boat brokers would ask how many grandchildren we had. The answer was, and is, zero - but no matter to the admiral. The extra cabins are useful for storage of course. And *that* is how you end up with a 50 footer that weighs about 40 tons fully loaded. :-) The redundant critical systems have paid off many times over, paticularly with the generators which get worked a lot. Well, when the other gender gets involved, some of the objective analysis gets shoved aside by subjective desires. It would be interesting to know all the criteria you considered and how you weighted them. You undoubtedly did some mental weighting, but seeing it on paper would be interesting. |
#9
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posted to rec.boats
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On Sep 9, 3:25*pm, John H wrote:
On Tue, 9 Sep 2008 11:17:13 -0700 (PDT), wrote: On Sep 9, 1:55*pm, John H wrote: One technique for multiple attribute decision making is to develop a weighted matrix listing the criteria used for the decision compared to the objects being considered. We'll use three boats as an example, Boat Alpha, Boat Bravo, and Boat Charlie. We must first identify the criteria which are important to us. For this example, I've chosen: Looks, Speed, Cost, and Length First we will determine the relative value of each criterion as compared to each other. I'll let Looks have a 1.0 value. Then I have to ask myself, is speed more or less important than looks. Let's say speed is half again as important as looks, then speed would get a value of 1.5. Each of the criteria are so weighted. Cost may be twice as important as looks, so it would get weighted with a 2.0. Length isn't as important as looks, so it gets a 0.8 Now we have to weight each boat in terms of the criteria. We'll use a number from 1 to 10 to weight each. Alpha is pretty ugly. Charlie is gorgeous. Alpha is the fastest, but not quite as fast as I'd like. Charlie is a dog. Bravo is the least costly, with Alpha not far behind. Charlie is quite expensive. Length is easy. I want a long boat, and Bravo is the longest. Alpha is the shortest. * * * * * * * * * *Alpha * * * * * *Bravo * * * * * * *Charlie Looks * * * * * 4 * * * * * * * * * * 6 * * * * * * * * * * 10 Speed * * * * *8 * * * * * * * * * * 5 * * * * * * * * * * * 3 Cost * * * * * * 7 * * * * * * * * * * 9 * * * * * * * * * * * 2 Length * * * * 3 * * * * * * * * * * 8 * * * * * * * * * * * 5 Now I apply the weight of the criteria to the score of each boat, and then get the total for each boat. * * * * * * * * * * * * Alpha * * * * * * *Bravo * * * * * * Charlie Looks (1.0) * * * * 4 * * * * * * * * * * * *6 * * * * * * * * * 10 Speed(1.5) * * * * 6 * * * * * * * * * * * *7.5 * * * * * * * * *4.5 Cost * (2.0) * * * *14 * * * * * * * * * * *18 * * * * * * * * * *4 Length(0.8) * * * * *2.4 * * * * * * * * * 6.4 * * * * * * * * * 4.0 Totals * * * * * * * * 26.4 * * * * * * * * *37.9 * * * * * * * * 22.5 And the winner is Charlie! Of course, for an actual selection many more criteria would be involved. And, the technique can be much more specific by using pairwise comparisons for each of the criteria. I used a simple comparison of each criterion to speed, but it could be that comparing length to cost, length should not be less than half as important as cost. When done with a computer program, the results can be used to show 'consistency' (or lack thereof) in the weight of each criteria. This technique was used, and may still be, as a way to evaluate officers for selection to promotion or command positions in the Army. Lemme guess, you got promoted on looks versus speed, right?!!! Hey, when you're investing many thousands, spending a couple hours doing some analysis can pay off in a big way. It does take time, but only because of the thinking involved.- Hide quoted text - - Show quoted text - Hey, John, it was a joke, you ain't pretty, neither!!!!!! |
#10
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![]() wrote in message ... Hey, John, it was a joke, you ain't pretty, neither!!!!!! --------------------------------------------------------------------- ~~ Snerk ~~ |
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