Oecd glossary of statistical terms sampling frame definition. The sampling frame is the list from which the sample is selected, so the quality of the sampling frame affects the quality of the sample. The frame may consist of either a list of units or a map of area in case sample of area is being taken, such that every element in the population belongs to one and only one unit. In this lesson, you will learn about the definition of a sampling frame and. If, for instance, we wanted to sample people in a city, we could list all the blocks in the city to create the frame, draw a simple random sample of blocks, and interview all people in housing units in the selected blocks. Target population and sampling frame in survey sampling the. Contacting members of the sample stratified random sampling convenience sampling quota sampling thinking critically about. What you want to talk about what you actually observe in the data population sampling frame sampling process inference sample 4. Sampling frame definition of sampling frame by medical.
Sampling frame listing of population from which a sample is chosen 3. When conducting research, its important to define the population that youre interested in by using a sampling frame. A welldesigned, wellimplemented random sample can be generalized to a sample frame. The sampling frame defines a set of elements from which a researcher can select a sample of the target population.
We described procedures for drawing samples from the. Aug 21, 2016 a sampling frame identifies the sampling units in a population and their locations. Im working on work for my statistics course, and i am confused on what the difference between population and sampling frame is. For example, such a list may be the electoral register, if information about those with voting rights is being sought, or the family practitioner committee lists if a health survey is projected, or vehicle registration lists, if car ownership or road transport is under study. If, for instance, we wanted to sample people in a city, we could list all the blocks in the city to create the frame, draw a simple random sample of blocks, and. This work is licensed under a creative commons attribution. Sampling frame and sampling unit learn basic statistics. This is often accomplished by applying expert knowledge of the population to select in a nonrandom manner. In addition, adequate information on the frame must be available to conduct sampling, data collection, weighting and nonresponse bias analyses. Probability sampling begins with identifying the sampling frame. Simple random sampling of individual items in the absence of.
Advantages a it is a good representative of the population. Sampling frame definition of sampling frame by the free. An important sampling frame for the illnessdeath model without recovery is the prevalent cohort study where a crosssectional sample of diseased is taken at a fixed calendar time. Not all records in a sample frame will lead to eligible survey respondents. A sampling frame is a list of all the items in which sampling can be drawn from in this case, stakeholders involved in the settlement scheme ishak, n. Insights from an overview of the methods literature abstract the methods literature regarding sampling in qualitative research is characterized by important inconsistencies and ambiguities, which can be problematic for students and researchers seeking a clear and coherent understanding. The sampling frame for nsrcf contained all of the statelicensed residential care facilities that were licensed for four or more beds and, based on information obtained during frame construction, appeared to meet the survey definition at the time of frame development.
A sampling frame is a list or database from which a sample can be used. Creating a sampling frame for populationbased veteran research. For example, in an opinion poll, possible sampling frames include an electoral register. A sample frame can be a list, or a set of procedures that could generate a list if needed. Figure 32 random sampling assumes that the units to be sampled are included in a list, also termed a sampling frame. For example, telephone directory, students data base from department of school education, list of school principal from the official website of concern department and. Munich personal repec archive a manual for selecting sampling techniques in research alvi, mohsin university of karachi, iqra university 23 march 2016 online at mpra paper no. Definition of the sampling frame and sample the sample was drawn from records of army, air force, marine corps, and navy personnel who were reported to have served in odsds between august 1, 1990, and july 31, 1991. Disadvantages a it is a difficult and complex method of samplings. Lets begin by covering some of the key terms in sampling like population and sampling frame. Article information, pdf download for sample frame and related sample.
Ideally, the sampling frame perfectly coincides with the target population of course, the ideal is not always possible. A sampling frame is a list of the actual cases from which sample will be drawn. In all, 3,264 records were sampled from 536,790 eligible records, evenly divided across the army, the air force, and the marine corps combined. A sampling frame could be telephone numbers be they landline, mobile, or both, dmv records, voter registration lists, all of the people who frequented the school common area at the time you collected your data, etc. A sampling frame includes a numerical identifier for each individual, plus other identifying information about characteristics of the individuals, to aid in analysis and allow for division into further frames for more indepth analysis. A sampling frame is a list or other device used to define a researchers population of interest. Sampling techniques introduction to sampling distinguishing between a sample and a population simple random sampling step 1. A sampling frame identifies the sampling units in a population and their locations. Sample frame and related sample design issues for surveys of. The rest of this section summarizes the sampling frame development and. The definition also encompasses the purpose of sampling frames, which is to provide a means for choosing the particular members of the target population that are to be interviewed in the survey. Then the all the households of abc nationals is the the target population. Examples of nonlist frames include a set of telephone numbers for random digit dialing and all housing units in a defined geographic area for.
It may consist of a listing of sampling units, or it may be based on a map of the population area within which sampling units can be observed. Simple random sampling, systematic sampling, stratified sampling fall into the category of simple sampling techniques. Information and translations of sampling frame in the most comprehensive dictionary definitions resource on the web. Prior to selecting a sample you need to define a sampling frame, which is a list of all the units of the population of interest. You have a sampling frame list of 10,000 people and you need a sample of for your studywhat is the sampling interval that you should follow.
Comprehensive list of all factors in a populace wherein a sample is being taken. Segments are cheaper to define with reference to a regular grid which is often square in. This list should be numbered in sequen tial order from one to the total number of units in the population. We are going to see from diverse method of five different sampling considering the nonrandom designs. Suppose the objective of the survey is to estimate the per household income of abc national in a city. In statistics, a sampling frame is the source material or device from which a sample is drawn. Pdf in order to answer the research questions, it is doubtful that researcher should be able to collect data from all cases. Without such a frame, or its equivalent, methods of sampling with assured properties such unbiasedness are not available. Pdf when a sampling frame is based on a geographic space, it is usually called an area sampling frame. When deciding upon a file to serve as a source for a sample frame for a survey, perhaps the most important consideration is the extent to which the target population will be covered by the frame. Nonprobability sampling is a sampling procedure that will not bid a basis for any opinion of probability that elements in the universe will have a chance to be included in the study sample. Sampling frame is the list of subjectspeople under the study, such as household, students, teachers, principals and so forth. The sampling frame should include summary information of key features of all units in the population of interest.
Representativeness and overlap of va and department of defense databases. The next step is to create the sampling frame, a list of units to be sampled. Target populations, sampling frames, and coverage error. This is a collection of data that lists all of the constituent units of the population e. A manual for selecting sampling techniques in research. The list should be comprehensive as well as latest. For inventory of large forests or other populations, it is common for no list of individual plants to exist, but it is common to have available a map of the area. Many load your data into a spreadsheet where you can perform a variety of manual or automatic operations, including smoothing and. Error analysis of sampling frame in sample survey citeseerx. Broaden definition of who can be in sampling frame idea. The list of all the sampling units with a proper identification which represents the population to be covered is called sampling frame. All subsets of the frame are given an equal probability. Sometimes the frame will be larger or smaller, depending on practical ways of getting in touch with each member of the sample.
Sampling frame financial definition of sampling frame. Sampling frames must be up to date, complete, affordable and easy to use and. The main objective of a purposive sample is to produce a sample that can be logically assumed to be representative of the population. Sampling definition is the act, process, or technique of selecting a suitable sample. A sample frame is the listing of the units from which a sample is to be selected. Make sure you understand this research tool with this interactive quiz and printable worksheet.
Please note that some file types are incompatible with some mobile and tablet devices. For example, it is difficult to prepare the sampling frame of village committees and neighborhood committees in a province. A set of information used to identify a sample population for statistical treatment. Creating a sampling frame for populationbased veteran. Appendix b definition of the sampling frame and sample. Sampling, measurement, distributions, and descriptive statistics chapter 9 distributions. Many times it is quite difficult to find a sampling frame that. In the most straightforward cases, such as when dealing with a batch of material from a production run, or using a census, it is possible to identify and measure every single item in the population and to include any one of them in our sample. This work is licensed under a creative commons attributionnoncommercialsharealike license. In market research terms, a sampling frame is a database of potential respondents that can be drawn from to invite to take part in a given research project.
Population, sample and sampling distributions i n the three preceding chapters we covered the three major steps in gathering and describing distributions of data. The sampling frame is the list from which units are drawn for the sample. The sampling frame was constructed first by merging the personnel database and the monthly database by service and then by selecting the members of the sampling frame. Surveys of housing units, where an individual is asked who lives in the house, frequently misses some people.
Broaden the definition of who can be in the sampling frame, then screen out as necessary incurs extra costs and requires additional effort example. A purposive sample, also referred to as a judgmental or expert sample, is a type of nonprobability sample. A catheter is inserted either through the cervix or through the abdominal wall and fetal chorionic villus tissue for analysis is aspirated under ultrasonic guidance. Sampling interval tells the researcher how to select elements from the frame 1 in k. For an easy example of these types of frame errors, consider sampling. Sampling frames article about sampling frames by the free.
A simple definition of a sampling frame is the set of source materials from which the sample is selected. The first stage in the sampling process is to clearly define target population. Apr 05, 2010 the sampling frame should include summary information of key features of all units in the population of interest. The monthly database, as received from usascurr, consisted of 696,643 records, of which 1 were duplicate records by name and social security number ssn. You can only apply your research findings to the population defined. For instance, to draw a simple random sample of 100 units, choose one unit at random from the frame.
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