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This article suggests a model-assisted variance estimator for the ordinary ratio estimator under the Midzuno-Sen sampling scheme. To compare the suggested estimator empirically with available estimators a Monte Carlo comparison is carried out using real populations. The suggested estimator has performed very well and has taken non-negative values with probability 1.

Model-Assisted Nonnegative Variance Estimator of the Ratio Estimator under the Midzuno-Sen Sampling Scheme