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Analyses are underdetermined when the number of parameters to be estimated is greater than the number of data. This problem is also referred to as 'p >> n'.

4 votes

What is the intuition behind the idea that for linear regression, the number of observations...

The simple answer is that regression is just another way of saying curve-fitting, and presuming that the fitting is to be done to a polynomial, then there needs to be the same number of data points as …
Swamp Wizard's user avatar