Table 2 Selected unbiased linear estimators of θ
EstimatorFormulaWeights Embedded ImageαβγReference
Embedded ImageEmbedded ImageEmbedded Image00Embedded ImageWatterson (1975)
Embedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded Image0Tajima (1983)
Embedded ImageEmbedded ImageEmbedded Image0Embedded Image0Zeng et al. (2006)
Embedded ImageEmbedded ImageEmbedded ImageEmbedded Image00Fay and Wu (2000)
Embedded ImageEmbedded ImageEmbedded ImageFu and Li (1993)