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you must estimate before a problem then you can find out your real answer a compare
Taking body measurement is important in order to have a well fitted garment and it must be accurate.
First you must decide what is a "suitable degree of accuracy" for a particular problem. In many cases, 4 or 5 significant digits are appropriate, or even 3. But it depends a lot on the original data (the final result is not supposed to look more accurate than the accuracy you can justify from the original data), and the purpose of the data (in some cases you need a higher accuracy than in others).
To be accurate, an analogy must compare two things that are alike. For example, an analogy could compare the heart to a pump because they are both the same general thing.
Only as a starting point. As an analyst, you must then carefully compare your company to its competitors in the industry. Not all companies are alike and therefore one can not apply one set standard to evaluate it. You must compare you numbers to year over year figures to identify trends either bad or good. Finally, these numbers must still be evaluated against the integrity of the company's financial reporting and their accounting style. Only as a starting point. As an analyst, you must then carefully compare your company to its competitors in the industry. Not all companies are alike and therefore one can not apply one set standard to evaluate it. You must compare you numbers to year over year figures to identify trends either bad or good. Finally, these numbers must still be evaluated against the integrity of the company's financial reporting and their accounting style.