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  • 2015, Volume 16, Issue Number: 2 - Articles
    Some Improved Estimators for Ratio and Product of two Population Means Using auxiliary character and two phase Sampling scheme in the Presence of Non-Response
  • 2017, Volume 18, Issue Number: 2 - Articles
    Two General Classes of Chain Type Estimators for Product of Two Population Means Using Two Auxiliary Characters in The Presence of Nonresponse