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The Five Virtues of a Hypothesis

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I recently read a very good book called "The Web of Belief" by W.V. Quine and J.S. Ullian. Its basically a compact introduction to rational belief and an entry point to areas of philosophy, methodology of science, and philosophy of language. Here are some excerpts from the section on the virtues of a hypothesis. I thought it would be beneficial to any aspiring scientist. There are five in all, but I don't have time to type them all up atm, so here are the first three. I will finish them up tomorrow.

 

 

Virtue I: conservatism:

 

In order to explain the happenings that we are inventing it [hypothesis] to explain, the hypothesis may have to conflict with some of our previous beliefs; but the fewer the better. Acceptance of a hypothesis is of course like acceptance of any belief in that it demands rejection of whatever conflicts with it. The less rejection of prior beliefes required, the more plausable the hyothesis--other things being equal.

 

Often some hypothesis is available that conflicts with no prior beliefs. Thus we may attribute a click at the door to arrival of mail through the slot. Conservatism usually prevails in such a case; one is not apt to be tempted by a hypothesis that upsets prior beliefs when there is no need to resort to one. When the virtue of conservatism deserves notice, rather, is when something happens that cannot evidently be reconciled with our prior beliefs.

 

There could be such a case when our friend the amateur magician tells us what card we have drawn. How did he do it? Perhaps by luck, once chance in fifty-two; but this conflicts with our reasonable belief, if all unstated, that he would not have volunteered a performance that depended on that kind of luck. Perhaps the cards were marked; but this conflicts with our belief that he had no access to them, being ours. Perhaps he resorted to telepathy or clairvoyance; but this would wreak havoc with our whole web of belief. The counsel of conservatism is the slight-of-hand.

 

Conservatism is rather effortless on the whole, having inertia in its favor. But it is a sound strategy too, since at each step it sacrifices as little as possible of the evidential support, whatever that may have been, that our overall system of beliefs has hitherto been enjoying. The truth may indeed be radically remote from our present system of beliefs, so that we may need a long series of conservative steps to attain what may have been attained in one rash leap. The longer the leap, however, the more serious an angular error in the direction. For a leap in the dark, the likelihood of a happy landing is severely limited. Conservatism holds out the advantages of limited liability and a maximum of live options for each next move.

 

 

Virtue II: modesty:

 

One hypothesis is more modest than another if it is weaker in a logical sense; if it is implied by the other, without implying it. A hypothesis A is more modest than A and B as a joint hypothesis. Also, one hypothesis is more modest than another if it is more humdrum: that is, if the events that it assumes to have happened are of a more usual and familiar sort, hence more to be expected.

 

Thus suppose a man rings our telephone and ends by apologizing for dialing the wrong number. We will guess that he slipped, rather than that he was a burgler checking to see if anyone was home. It is the more modest of the two hypotheses, butterfingers being rife. We could be wrong, for crime is rife too. But still the butterfingers hypothesis scores better on modesty than the burglar hypothesis, butterfingers being rifer.

 

We habitually practice modesty, all unawares, when we identify recurrent objects. Unhesitatingly we recognize our car off there where we parked it, though it may have been towed away and another car of the same model may have happened to pull in at that spot. OUrs is the more modest hypothesis, because staying put is a more usual phenomenon than the alternative combination.

 

It tends to be the counsel of modesty that the lazy little world is the likely world. We are to assume as little activity as will suffice to account for appearances. This is not all there is to modesty. It does nto apply to the preferred hypothesis in the telephone example, since Mr. Butterfingers is not assumed to be a less active man than the one who might have plotted burglary. Modesty figured there merely in keeping the assumptions down, rather than in actually assuming inactivity. In the example of the parked car, however, the modest hypothesis does expressly assume there to be less activity than otherwise. This is a policy that guides science as well as common sence. It is even erected into an explicit principle of mechanics under the name of the law of least action.

 

Virtue III: simplicity:

 

Where simplicity considerations become especially vivid is in drawing curves through plotted points on a graph. Consider the familiar practice of plotting measurements. Distance up the page represents altitude above sea level, for instance, and distance across the page represents the temperature of the boiling water. We plot our measurements on the graph, one dot for each pair. However many points we plot, there remain infinitely man curves that may be drawn through them. Whatever curve we draw represents our generalization from the data, our prediction of what bioling temperatures would be found at altitudes as the slimplest curve that passes through or reasonably close to all the plotted points.

 

There is a premium on simplicity in any hypothesis, but the highest premium is on simplicity in the giant joint hypothesis that is science, or the particular science, as a whole. We cheerfully sacrifice simplicity of a part for greater simplicity o the whole when we see a way of doing so. Thus consider gravity. Heavy objects tend downward: here is an exceedingly simple hypothesis, or even a mere definition. However, we complicate matters by accepting rather the hypothesis that the heavy objects around us are slightly attracted also by one another, and by the neighboring mountains, and by the moon, and that all these competing forces detract slightly from the downward one. Newton prpounded this more complicated hypothesis even though, aside from tidal effects of the moon, he had no means of detecing the competing forces; for it meant a great gain in the simplicity of phyysics as a whole. His hypothesis of universal gravitation, which has each body attracting each in proportion to mass and inversely as the square of the distance, was what enabled him to make a single neat system of celestial and terrestrial mechanics.

 

Another famous triumph of this kind was achieved by Count Rumford and later physicists when they showed how the relation of gas pressure to temperature could be accounted for by the impact of oscillating particles, for in this way they reduced the theory of gases to the geenral laws of motion. Such was the kinetic theory of gases. In order to achieve it they had to add the hypothesis, by no means a modest one, that gas consists of oscillating particles or molecules; but the addition is made up for, and much more, by the gain in simplicity accruing to physics as a whole.

 

 

I will continue with the other two at a later time.

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An hypothesis can vary from person to person. But surely an good hypothesis is based on at least some fact and asumption based on the facts. But hypothesis can be wildly different if we take on intent as an ingredient in the building of the hypothesis even though facts dictate both hypothesis.

Example= The capitalist world is the ideal circumstance in which to invest capital for profit, so let the capitalist world thrive and let us make more profit.

Anti= The caspitalist ideal is to make more profit, at the expense of the poor, justice and the enviroment, so end capitalism.

I believe in the radical hypothesis. The one that takes time and energy to break down what is percieved as the norm. Always consider the man who screams the loudest.

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What`s the difference between a Hypothesis a Postulate and a Preposition or a Theory? they all seem quite similar to me, and just bigger words for "Idea".

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hypothesis:

http://dict.die.net/hypothesis/

 

postulate:

http://dict.die.net/postulate/

 

proposition (this is what I assume that you meant, YT2095, for a preposition is not really related to scientific terms rather, it is a grammatical modifying word):

http://dict.die.net/proposition/

 

theory:

http://dict.die.net/theory/

 

and for good measure, let's add...

theorem:

http://dict.die.net/theorem/

 

and...

idea:

http://dict.die.net/idea/

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Cheerz, it`s a little clearer now, still some vague areas of overlap however. but good in the main. Thnx man :)

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A hypothesis usually states that something, or in contrast nothing, will happen when you alter a single factor in an experiment. That nothing will happen (nothing out of the ordinary that is) is called the null hypothesis. That something (something out of the ordinary) happens is called the alternate hypothesis.

 

This means that an experiment tests two mutually exclusive hypotheses in order to determine whether or not a single factor produces an effect.

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could I "legaly" replace the word hypothesis with idea?

 

I hypothesise that if you use plastic the electicity wont pass and make a circuit.

 

my idea is that if you use plastic... blah blah...

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You can have a lot of consensus on a hypothesis but it doesn't add to its validity. Common sense usually helps judge the propositions as blike put forward. To some minds though stuff makes sense to an individual first and he has to get consensus. Valid accepted arguments help support the case.

It's hard to accept a hypothesis on faith alone.

Just aman

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Guest PaulTee

There is no such word as Homerism.

New moderator required.

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PaulTee said in post #13 :

There is no such word as Homerism.

New moderator required.

You are making this far too easy for me.

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I was going to make him have a basil brush theme, but this was easier.

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Blike, i need some help here!

Well, i find this really interesting. However i have trouble in understanding Virtue 1 and 3. It is really a bit too profound for me. But i understood Virtue 2, given the clear-cut examples. So, to confirm Virtue 2 is actually to tell you to think of other alternatives right? Like looking AT an obijects at different angles? Whereby the objects is the hypothesis/ idea and the angles are actually your approachs.

Well, i still need more explanation and exmples of Virtue1 and 3. :)

Sorry. :P i'm not that good.

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Odd. I thought it was rather simple, thus this has become my alternate contention. My precpice is as thus:

A proposition of a theory. It's all hypothetical.

Which upon correlative collaboration becomes a preposition to a Theorum.

One must then find themselves as to herefore ammended preposition to a proposition and accepted by the scientific community as established however only corroberated corelatively so as to become established in physics.

After observation in nature.

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However, there is much to be said in support for the use of plain and simple language, whereby communication is facilitated enormously and to a wide group of people, that have no desire to play games of verbal lexicon and just simply wish to understand a concept :)

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Although it is generally better to use the appropriate word in many situations, particularly in a scientific discussion (I'm not sure that's true here though ;))

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Guest Moti

Prabhupada: Hypothesis. Hypothesis. Just like yesterday I was explaining that as soon as there is a machine, there is an operator. This is hypothesis. You cannot expect machine going on without operator. Similarly, this material nature is a machine and the operator is God. This is hypothesis. Even though you do not see God we can make this suggestion. That is human reasoning, logic. If any ordinary typewriter machine... This is a machine, but that requires operator. He is pushing this button; then it is working. It is not automatically working, any machine. So how this big machine is operating without any operator? What is this nonsense? They say, "There is no God. Nature, nature." What is the nature? Nature is a machine. Just like this body. This body is machine, and the operator is the soul, and the guide is the Supersoul. As soon as the soul goes away, then the machine does not work. This is common sense. But they have no common sense; therefore they are rascals, so-called scientists and others.

They have no common sense.

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Post #22: Dogmatic cult links removed, e-mail notification turned off.

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wow, i really do need to finish these.

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Hypothesis are like food while cooking, smell good, look good, but it cant be not eateable.

in other words... you can only do 3 things with a hypothesis.

1.- Prove that its true

2.- Prove that its wrong

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