Research Article
A New Mixed Estimator in Nonparametric Regression for Longitudinal Data
Table 2
Summary of case study results.
| | Model | Number of knots | Number of oscillations | | GCV |
| | Truncated spline estimator | 1 | — | — | 391858.1 | | Fourier series estimator | — | 1 | — | 323174.4 | | 2 | 161621.0 | | 3 | 101785.9 | | 4 | 75480.3 |
| | Mixed truncated spline and Fourier series | 1 | 1 | 0.2041 | 48.5434 | | 2 | 10.0000 | 47.4535 | | 3 | 10.0000 | 45.3517 | | 4 | 9.3878 | 45.3519 | | 2 | 1 | 0.2041 | 51.6948 | | 2 | 10.0000 | 50.6872 | | 3 | 9.3878 | 48.7345 | | 4 | 7.1429 | 48.7347 |
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