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TYPES OF SAMPLING:
Sampling plans can be grouped under two categories-probability sampling and non-probability sampling. Probability sampling uses a technique by which the researcher ensures the probability, that each element of p~pulation will be included in the sample. That is each element has an equal or known chance of being included. It utilizes some form of random selection because of which greater confidence can be placed in the representativeness of probability samples. Non-probability samples use non-random methods i.e. there is bias in the selection. There is no assurance that every element has a chance of being included or, in other words the researcher cannot estimate the probability that each element will be included in the sample. Refer to Figure 4.1 and note the purpose of probability and non-probability sampling. The population values such as mean of standard deviation is called a Parameter whereas the measured value of the sample is termed statistic. We infer the parameter from the statistic when we know that the sample is a true representative of population. Refer Block 4 for further details of parameter and statistic.
Procedure: The actual process of document selection may be initiated in different ways. The acquisition staff take note of the desirable items and present them to the subject
A Structural Model: domain, community and practice In spite of having a variety of forms which the communities of practice take a lot of basic structure is shared. A community
Selective Dissemination of Information (SDI): Selective dissemination of information is a method of supplying each user or a group of users with the references of documents or
Microforms: Micropublishing is retrospective, being merely the reprinting of previously existing materials. Back files of newspapers, periodicals and out-of-print materials a
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The majority of the queries/questions that LIS personnel will have to deal with are about subjects. An answer to such a query, in whatever form it may finally be presented to suit
Library Binding: Binding should be appropriate to the type of material and to the expected use. Early binding for libraries stressed strength, appearance being only a seconda
whom do you think rajender will eat with? Why?
How Does Internet Work? Let us try to know, some of the technicalities relating to the working of Internet. It may be stated that the procedure of Internet's working is associ
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