# quantifying interaction between variables in an equation [closed]

What do I need to measure interaction between variables in a particular equation?

For e.g. Me just taking 50 grams of protein everyday will help me health wise. Me just doing exercise for 1 hour everyday will help me health wise. Me just stretching 1 hour everyday will help me health wise. Etc.

But Combing two of the above things will help me more health wise than just doing one. And combining all three will help me even more than just doing two of the above things.

For e.g. Taking 50 gm protein and doing 1 hour exercise everyday is beneficial than just doing one or the other. How does taking 50 grams of protein complement exercising 1 hour every day, by how much?

What I want to find out is, a way to measuring interaction between these things. How can I quantify a relationship between each above?

What type of data-set will I need to quantify how they compliment each other?

Note: I don't know if this is the right place to post this question. Please suggest.

Any suggestions are much appreciated.

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 This seems a fair question, if an elementary one, so I think it was unkind to close it. Anyhow, you need to define some quantitative indicator for health i.e. something you can attach a number to. Now construct (i.e. guess) an equation that describes this health number as a function of amount of protein, exercise and stretching. use your guessed equation to calculate the effects of changing the protein, exercise and stretching then do the experiment to see if your equation gets it right. Your first guess was unlikely to be correct, so you adjust your equation and try again. – John Rennie Mar 7 at 10:19 I've said "construct an equation" as if it was easy, but this step is hard and it's what distinguishes the great scientists from the merely good. This process is basically what Einstein went through in constructing the theory of General Relativity and he made plenty of wrong guesses along the way before getting it right in 1915. – John Rennie Mar 7 at 10:21

## closed as off topic by Qmechanic♦Mar 7 at 1:13

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