Research Article
Smoothed Conditional Scale Function Estimation in AR(1)-ARCH(1) Processes
Table 2
Mean average squared errors (MASE).
| Kern. func. | | | | |
| | | mase (.25) |
| Gaussian | 250 | 0.0017 | 0.0013 | 0.0010 | 0.0008 | 0.0010 | 0.0009 | 500 | 0.0011 | 0.0008 | 0.0008 | 0.0007 | 0.0007 | 0.0006 | 1,000 | 0.0006 | 0.0004 | 0.0005 | 0.0004 | 0.0005 | 0.0004 |
| Epanech | 200 | 0.0012 | 0.0009 | 0.0013 | 0.0011 | 0.0011 | 0.0009 | 500 | 0.0007 | 0.0006 | 0.0010 | 0.0008 | 0.0011 | 0.0009 | 1,000 | 0.0006 | 0.0004 | 0.0007 | 0.0005 | 0.0006 | 0.0005 |
| Triweight | 200 | 0.0005 | 0.0005 | 0.0006 | 0.0005 | 0.0006 | 0.0005 | 500 | 0.0006 | 0.0005 | 0.0005 | 0.0004 | 0.0005 | 0.0004 | 1,000 | 0.0003 | 0.0002 | 0.0003 | 0.0002 | 0.0004 | 0.0003 |
| | | mase (.50) |
| Gaussian | 250 | 0.0054 | 0.0045 | 0.0063 | 0.0055 | 0.0051 | 0.0043 | 500 | 0.0036 | 0.0029 | 0.0048 | 0.0042 | 0.0047 | 0.0038 | 1,000 | 0.0028 | 0.0022 | 0.0025 | 0.0021 | 0.0028 | 0.0023 |
| Epanech | 200 | 0.0067 | 0.0057 | 0.0105 | 0.0091 | 0.0071 | 0.0060 | 500 | 0.0045 | 0.0036 | 0.0057 | 0.0046 | 0.0042 | 0.0034 | 1,000 | 0.0031 | 0.0026 | 0.0041 | 0.0033 | 0.0029 | 0.0023 |
| Triweight | 200 | 0.0008 | 0.0007 | 0.0030 | 0.0026 | 0.0039 | 0.0034 | 500 | 0.0023 | 0.0020 | 0.0021 | 0.0018 | 0.0025 | 0.0021 | 1,000 | 0.0019 | 0.0016 | 0.0016 | 0.0013 | 0.0016 | 0.0013 |
| | | mase (.75) |
| Gaussian | 250 | 0.0234 | 0.0183 | 0.0237 | 0.0197 | 0.0294 | 0.0253 | 500 | 0.0227 | 0.0178 | 0.0223 | 0.0178 | 0.0171 | 0.0132 | 1,000 | 0.0099 | 0.0079 | 0.0138 | 0.0110 | 0.0125 | 0.0095 |
| Epanech | 200 | 0.0156 | 0.0123 | 0.0266 | 0.0223 | 0.0274 | 0.0227 | 500 | 0.0184 | 0.0152 | 0.0235 | 0.0189 | 0.0181 | 0.0147 | 1,000 | 0.0162 | 0.0130 | 0.0102 | 0.0074 | 0.0136 | 0.0106 |
| Triweight | 200 | 0.0190 | 0.0176 | 0.0145 | 0.0127 | 0.0167 | 0.0150 | 500 | 0.0112 | 0.0099 | 0.0131 | 0.0113 | 0.0097 | 0.0081 | 1,000 | 0.0075 | 0.0064 | 0.0073 | 0.0058 | 0.0069 | 0.0056 |
| | | mase (.90) |
| Gaussian | 250 | 0.0880 | 0.0692 | 0.1180 | 0.0893 | 0.0971 | 0.0770 | 500 | 0.0468 | 0.0377 | 0.0890 | 0.0644 | 0.0742 | 0.0525 | 1,000 | 0.0932 | 0.0690 | 0.0491 | 0.0367 | 0.0510 | 0.0365 |
| Epanech | 200 | 0.0664 | 0.0577 | 0.1074 | 0.0866 | 0.1050 | 0.0844 | 500 | 0.0816 | 0.0515 | 0.0827 | 0.0625 | 0.0879 | 0.0617 | 1,000 | 0.0740 | 0.0510 | 0.0449 | 0.0315 | 0.0373 | 0.0274 |
| Triweight | 200 | 0.0510 | 0.0434 | 0.0452 | 0.0382 | 0.0467 | 0.0402 | 500 | 0.0453 | 0.0337 | 0.0390 | 0.0333 | 0.0391 | 0.0328 | 1,000 | 0.0172 | 0.0133 | 0.0268 | 0.0205 | 0.0267 | 0.0209 |
|
|