Table 6 Analysis of variance (ANOVA) for the fitted polynomial models (35 and 130 kHz) for DCF removal using US/ANF.
Response: DCF removal (%) | Df | Sum Sq | Mean Sq | F value | Pr(> F) | |
|---|---|---|---|---|---|---|
35 kHz | First-order | 3 | 1084.5 | 361.5 | 93.3796 | 1.49 × 10–11 |
Two-way interaction | 3 | 34.07 | 11.36 | 2.934 | 0.05984 | |
Pure quadratic | 3 | 405.93 | 135.31 | 34.9519 | 6.18 × 10–08 | |
Residuals | 19 | 73.55 | 3.87 | |||
Lack of fit | 5 | 18.21 | 3.64 | 0.9214 | 0.49565 | |
Pure error | 14 | 55.34 | 3.95 | |||
130 kHz | First-order | 3 | 832.42 | 277.472 | 548.2421 | 2.20 × 10–16 |
Two-way interaction | 3 | 32.61 | 10.87 | 21.4771 | 2.53 × 10–06 | |
Pure quadratic | 3 | 421.56 | 140.519 | 277.6433 | 7.29 × 10–16 | |
Residuals | 19 | 9.62 | 0.506 | |||
Lack of fit | 5 | 2.47 | 0.493 | 0.9657 | 0.4712 | |
Pure error | 14 | 7.15 | 0.511 | |||
