| Model Browser User's Guide | |
Degrees of Freedom Table
To see the Degrees of Freedom table (and the information about each display), click the 
toolbar button or select View -> Matrix Information.
| Source |
D.F. |
| Model |
p |
| Residual |
n-p |
| Replication |
by calculation |
| Lack of fit |
by calculation |
| Total |
n |
Replication is defined as follows:
Let there be nj (>1) replications at the jth replicated point. Then the degrees of freedom for replication are
and Lack of fit is given by n - p - degrees of freedom for replication.
Note that replication exists where two rows of X are identical. In regular designs the factor levels are clearly spaced and the concept of replication is unambiguous. However, in some situations spacing can be less clear, so a tolerance is imposed of 0.005 (coded units) in all factors. Points must fall within this tolerance to be considered replicated.
| | Standard Error | Design Evaluation Graphical Displays | |
