![]() In such cases it often does not matter which scale is put on which axis of the scatter diagram. The yield of the one does not seem to be “dependent” on the other in the sense that, on average, the height of a child depends on his age. ![]() It is reasonable, for instance, to think of the height of children as dependent on age rather than the converse but consider a positive correlation between mean tar yield and nicotine yield of certain brands of cigarette.’ The nicotine liberated is unlikely to have its origin in the tar: both vary in parallel with some other factor or factors in the composition of the cigarettes. This confusion is a triumph of common sense over misleading terminology, because often each variable is dependent on some third variable, which may or may not be mentioned. The words “independent” and “dependent” could puzzle the beginner because it is sometimes not clear what is dependent on what.
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