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A chain ratio exponential type estimator in two-phase sampling using auxiliary information
Yadav, Rohini, (2013)
Use of tranformed auxiliary variable in the estimation of population ratio in sample surveys
Upadhyaya, Lakshmi N., (2000)
The use of a known coefficient of variation in the estimation of mean of a normal distribution from double samples
Upadhyaya, Lakshmi N., (2001)