Name: SAMPLING
Uploaded: 2021-10-28
Duration: 2 min 1 s
Description: SAMPLING. MR. JENISH VARGHESE OFFICER – HR DEVELOPMENT & NURSE EDUCATION.

SAMPLING. MR. JENISH VARGHESE OFFICER – HR DEVELOPMENT & NURSE EDUCATION. 

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MR. JENISH VARGHESE OFFICER – HR DEVELOPMENT  & NURSE EDUCATION

DEFINITION OF THE SAMPLING. Procedure by which some members of the population are selected as representatives of the entire population. 

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Procedure by which some members of the population are selected as representatives of the entire population

STUDY POPULATION. A study population is the population to which the results of the study will be inferred .. 

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A study population is the population to which the results of the study will be inferred  .

The study population depends upon the research question. 

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The study population depends upon the research question

•  How many injections do people received each year in India?   Study population: Population of India  How many needle-sticks health care workers experience each year in India?  Study population: Health care workers of India  How many hospitals have a needle-sticks prevention policy in India  Study population: Hospitals of India

Definition of sampling terms. Sampling unit (Basic sampling unit, BSU) Elementary unit that will be sampled People Health care workers Hospitals • Sampling frame List of all sampling units in the population • Sampling scheme Method used to select sampling units from the sampling frame. 

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Sampling unit (Basic sampling unit, BSU)   Elementary unit that will be sampled  People  Health care workers  Hospitals  •  Sampling frame  List of all sampling units in the population  •  Sampling scheme  Method used to select sampling units from the sampling frame

Practical example. The Ministry of Health of a country X wants to estimate the proportion of children in elementary schools who have been immunized against childhood infectious diseases . The task must be completed in one month The objective is to estimate the proportion of immunized children. 

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The Ministry of Health of a country X wants to estimate the proportion of children in elementary schools who have been immunized against childhood infectious diseases . The task must be completed in one month  The objective is to estimate the proportion of immunized children

Why do we sample populations?. Obtain information from large populations Ensure the efficiency of a study Obtain more accurate information. 

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Obtain information from large populations  Ensure  the efficiency of a study  Obtain more accurate information

Type of samples. Non-probability samples Probability of being selected is unknown Convenience samples Biased Best or worst scenario Subjective samples Based on knowledge Time/resources constraints. 

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Non-probability samples  Probability of being selected is unknown  Convenience samples  Biased   Best or worst scenario  Subjective samples  Based on knowledge  Time/resources constraints

Type of samples. • Probability samples Every unit in the population has a known probability of being selected Only sampling method that allows to draw valid conclusions about population. 

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•  Probability samples  Every unit in the population has a known probability of being selected  Only sampling method that allows to draw valid conclusions about population

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Random sampling in probability samples. Removes the possibility of bias in selection of subjects Ensures that each subject has a known probability of being chosen Allows application of statistical theory. 

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Removes the possibility of bias in selection of subjects  Ensures that each subject has a known probability of being chosen   Allows application of statistical theory