Question

how to increase the number of degree of freedom for SSE if there is only one observation?

Answer 1

The residual degrees of freedom is defined as the number of response values n minus the number of fitted coefficients p estimated from the response values.

• degrees of freedom(df) = n-p

Here df denotes the number of independent pieces of information involving the n data points that are required to calculate the sum of squares. Note that if parameters are bounded and one or more of the estimates are at their bounds, then those estimates are regarded as fixed. The degrees of freedom is increased by the number of such parameters.but to increase the df you have to increase the value of n sometimes.