Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal Unbiased Estimation for Maximal Distribution   Unbiased estimation for parameters of maximal distribution is a very
fundamental problem in the statistical theory of sublinear expectation. In this
paper, we proved that the maximum estimator is the largest unbiased estimator
for the upper mean and the minimum estimator is the smallest unbiased estimator
the the lower mean.

18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an