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Estimated parameters and evaluation criteria for the 2nd order polynomial equations for HMP 140A capacitive sensors using four different calibration points.
| Case 1 (n1 = 11) |
Case 2 (n2 = 9) |
Case 3 (n3 = 7) |
Case 4 (n4 = 5) |
|
|---|---|---|---|---|
| b0 | 3.479580 | 3.156891 | 2.871078 | 2.9113205 |
| b1 | 0.833274 | 0.844157 | 0.862302 | 0.8142171 |
| b2 | 0.00186718 | 0.00176878 | 0.00161775 | 0.00155423 |
| R 2 | 0.9975 | 0.9992 | 0.9994 | 0.9995 |
| s | 0.6837 | 0.7127 | 0.7490 | 0.7890 |
