Or in what circumstance, something can be so called?

Or in what circumstance, something can be so called?

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送交者: hopelessless 于 2013-04-02, 15:31:57:

回答: Why is something called a first-order effect, or a second-order effect? 由 hopelessless 于 2013-04-02, 15:27:57:

for example, y=a0+a1*x+a2*x^2+a3*x^3 ..... - 008 (15 bytes) 2013-04-02, 18:26:16 (712369)