Mukhopadhyay, Nitis; Chattopadhyay, Bhargab - In: Statistical Papers 54 (2013) 3, pp. 827-837
</Superscript>, the sample variance, which is also well-known to be alternatively expressed in the form of an U statistic with a … construct unbiased estimators of a population variance by U statistics with symmetric kernels of degree higher than two …