Principle of Sample Survey| Statistical Regularity| Statistical Validity| Optimization| Statistics||

Principle of Sample Survey| Statistical Regularity| Statistical Validity| Optimization| Sample Survey| Statistics| By-Dr. Shilpi Tanti| Statinfy|| Lecture Series on Sample Survey: Part-4 There are three basic principles of sample survey: 1) Principle of Statistical Regularity: According to the principle of statistical regularity we mean that a moderately large number of items chosen at random from a large group are almost sure on the average to possess the characteristics of the large group. This principle has also its origin in the law of large numbers of the theory of probability. 2) Principle of Statistical Validity: By validity of a sample design, we mean that the sample should be so selected that the results could be interpreted objectively in terms of probability. According to this, sampling provides valid estimates about population parameters. This principle ensures that there is some definite and preassigned probability for each individual of the aggregate (population) to be included in the sample. 3) Principle of Optimization: The principle of optimization takes into account the factors of (a) Efficiency: Efficiency is measured by the inverse of sampling variance of the estimator. The principle of optimization ensures that a given level of efficiency will be reached with the minimum possible resources and minimum cost. (b) Cost: Cost is measured by expenditure incurred in terms of money or man powers. So, the term optimization means that, it is based on developing methods of sample selection and of estimation; these provide a given value of cost with the maximum possible efficiency. All these you may find in books, but to clear your concept, please watch the video till the end. Please watch more videos on sampling by clicking the link of the series of sampling https://www.youtube.com/playlist?list=PLF53dCIC0ZYztp_LdmbZQI0fdRuxuOzW1 Please subscribe my channel to get more videos on Statistics https://www.youtube.com/channel/UCY87Q4G0g7n5MX5KhtIXF-w ******************************************************************************* ******************************************************************************* ******************************************************************************* Thank you; #Statinfy #principleofsamplesurvey #statisticalregularity #statisticalvalidity #optimization