External validity & non-probability sampling.

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ijmr2015v141n4p487.pdf (175.83 KB)
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2015-04
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Raina Sunil Kumar. External validity & non-probability sampling. Indian Journal of Medical Research. 2015 Apr; 141(4): 487-488.
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https://imsear.searo.who.int/handle/123456789/170172
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Indian Journal of Medical Research