Months | Graphical method | Empirical method | Modified maximum likelihood method | Energy pattern factor method | ||||
---|---|---|---|---|---|---|---|---|
k | c (m/s) | k | c (m/s) | k | c (m/s) | k | c (m/s) | |
Apr 2011 | 1.7438 | 5.6863 | 2.1545 | 6.4137 | 2.0761 | 6.3507 | 2.1681 | 6.4137 |
May 2011 | 2.3472 | 9.0708 | 3.3229 | 9.3500 | 3.2595 | 9.2646 | 3.0793 | 9.3845 |
Jun 2011 | 2.0217 | 9.7378 | 2.9515 | 10.1866 | 2.9708 | 10.1471 | 2.8994 | 10.1942 |
Jul 2011 | 2.0981 | 7.7550 | 2.7184 | 8.2294 | 2.6535 | 8.1868 | 2.6637 | 8.2351 |
Aug 2011 | 1.8876 | 5.8166 | 2.6121 | 6.6079 | 2.5513 | 6.5499 | 2.6569 | 6.6044 |
Sep 2011 | 2.1592 | 6.3457 | 3.0948 | 6.8103 | 3.0623 | 6.7587 | 2.9802 | 6.8218 |
Oct 2011 | 1.5196 | 4.5302 | 1.8902 | 5.2394 | 1.7922 | 5.1967 | 1.9311 | 5.2428 |
Nov 2011 | 1.5284 | 3.4343 | 1.9543 | 4.0376 | 1.8758 | 4.0250 | 2.0225 | 4.0404 |
Dec 2011 | 1.5917 | 4.4552 | 2.1348 | 5.0925 | 2.0331 | 5.0567 | 2.2038 | 5.0924 |
Jan 2012 | 1.6794 | 4.5200 | 2.1957 | 5.1489 | 2.1198 | 5.1213 | 2.2430 | 5.1484 |
Feb 2012 | 1.8906 | 5.1810 | 2.3963 | 5.7532 | 2.3343 | 5.7274 | 2.4081 | 5.7527 |
Mar 2012 | 1.7159 | 5.6665 | 2.0785 | 6.2319 | 2.0251 | 6.2152 | 2.0626 | 6.2314 |