or Trimmed mean,
or Hampel estimate of location,
or Biweight mean
Trimmed mean: Andrews, D. F.; Bickel, P. J.; Hampel, F. R.; Huber, P. J.; Rogers, W. H.; and Tukey, J. W. Robust Estimates of Location: Survey and Advances. Princeton: Princeton University Press, 1972. p. 2B1
Hampel Estimate: Andrews, D. F.; Bickel, P. J.; Hampel, F. R.; Huber, P. J.; Rogers, W. H.; and Tukey, J. W. Robust Estimates of Location: Survey and Advances. Princeton: Princeton University Press, 1972. p. 2C3
Biweight Mean: Mosteller, F., and Tukey, J. W. Data Analysis and Regression. Reading Massachusetts: Addison-Wesley 1977. p. 205