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Which dimension corresponds to the explanatory variables collected for each species?

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Which dimension corresponds to the explanatory variables collected for each species? (a) First (b) Second (c) Third (d) Fifth The question was asked in unit test. This interesting question is from Data Types topic in section Nuts and Bolts and Getting Data In and Out of R Programming Select the correct answer from above options

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Correct choice is (b) Second For explanation I would say: The second dimension corresponds to the explanatory variables collected for each species. The third dimension corresponds to the species.

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