Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improvement in Estimating Population Mean using Two Auxiliary Variables
  in Two-Phase Sampling   This study proposes improved chain-ratio type estimator for estimating
population mean using some known values of population parameter(s) of the
second auxiliary character. The proposed estimators have been compared with
two-phase ratio estimator and some other chain type estimators. The
performances of the proposed estimators have been supposed with a numerical
illustration.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat