If you have N data points, then you can fit the points exactly with a **polynomial** of **degree** N-1.

The **degrees of freedom** in a multiple **regression** equals N-k-1, where k is the number of variables.

If you have N data points, then you can fit the points exactly with a **polynomial** of **degree** N-1.

The **degrees of freedom** in a multiple **regression** equals N-k-1, where k is the number of variables.

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