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Table 5 FDSR results of ΔLODR, the estimated harmonic signals and their parameter estimation

From: On the ~ 7 year periodic signal in length of day from a frequency domain stepwise regression method

Period (years) Amplitude (ms) C (ms) S (ms) \({C}_{H}\)
22.30 + 1.621e−01 − 1.598e−01 + 2.607e−02  
± 7.403e−03 ± 7.458e−03 ± 8.269e−03 0.71
17.94 + 1.354e−01 − 3.683e−02 − 1.300e−01  
  ± 8.417e−03 ± 1.022e−02 ± 8.306e−03 0.04
13.50 + 1.857e−01 − 1.546e−01 + 1.025e−01  
  ± 7.712e−03 ± 8.111e−03 ± 7.331e−03 0.51
11.20 + 6.324e−02 + 6.066e−02 − 1.696e−02  
  ± 6.553e−03 ± 6.705e−03 ± 5.927e−03 0.14
8.319 + 7.629e−02 − 7.246e−02 − 2.335e−02  
  ± 4.731e−03 ± 4.701e−03 ± 4.858e−03 0.36
6.957 + 3.993e−02 − 3.716e−02 + 1.380e−02  
  ± 4.772e−03 ± 4.902e−03 ± 4.577e−03 0.31
5.903 + 1.273e−01 − 4.187e−02 − 1.201e−01  
  ± 4.404e−03 ± 4.398e−03 ± 4.428e−03