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Topic: Survey sampling

	Survey sampling - Wikipedia, the free encyclopedia
		In statistics, survey sampling is random selection of a sample from a finite population.
		The possibility of very expensive or very atypical samples has led to a variety of modifications such as stratified sampling, cluster sampling, and multistage sampling.
		The samples in such surveys are therefore non-probability samples of the population, and the validity of estimates of parameters based on them is unknown.
	en.wikipedia.org /wiki/Survey_sampling (237 words)

	Encyclopedia: Survey sampling (Site not responding. Last check: 2007-11-06)
		Stratified sampling is a method of sampling from a population in statistics.
		Sampling is the use of a subset of the population to represent the whole population.
		Sampling (statistics) Sampling is that part of statistical practice concerned with the selection of individual observations intended to yield some knowledge about a population of concern, especially for the purposes of statistical inference.
	www.nationmaster.com /encyclopedia/Survey-sampling (479 words)

	Basic Monthly Survey Sampling
		The sample initially was selected to meet specific reliability criteria for the Nation, for each of the 50 States and the District of Columbia, and for the substate areas of New York City and the Los Angeles-Long Beach metropolitan area.
		The sampling ratio occasionally is modified slightly to hold the size of the sample relatively constant given the overall growth of the population.
		In a sample PSU with a probability of selection of 1 in 10 and a State sampling ratio of 3,000, a within-PSU sampling ratio of 1 in 300 achieves the desired ratio of 1 in 3,000 for the stratum.
	www.bls.census.gov /cps/bsampdes.htm (2125 words)

	Introduction to Sampling
		With nonprobability sampling, in contrast, population elements are selected on the basis of their availability (e.g., because they volunteered) or because of the researcher's personal judgment that they are representative.
		Samples are evaluated primarily according to the procedures by which they were selected rather than by their final composition or size.
		Studies with such samples are useful primarily for documenting that a particular characteristic or phenomenon occurs within a given group or, alternatively, demonstrating that not all members of that group manifest a particular trait.
	psychology.ucdavis.edu /rainbow/html/fact_sample.html (2255 words)

	Survey Sampling Methods
		Sampling error is the degree to which a sample might differ from the population.
		Stratified sampling is often used when one or more of the stratums in the population have a low incidence relative to the other stratums.
		Quota sampling is the nonprobability equivalent of stratified sampling.
	www.statpac.com /surveys/sampling.htm (742 words)

	Needs Survey Sampling Techniques
		The way to determine who comprises the sample depends on a number of factors, such as the availability of and access to the individuals in the representative group, the availability of resources to use in the selection of the sample, and the technical expertise of those involved in the data collection.
		Proportional random sampling allows for the sample to be taken using simple random sampling for each of the subgroups (for example, male and female), according to their representation proportionately to the entire group.
		Equal allocation stratified sampling is used when the same percent of the group members is selected from each group, using simple random sampling, regardless of the total size of the group.
	www.michigan.gov /mdcd/0,1607,7-122-1680_19117_19133-52061--,00.html (838 words)

	Expertss.com
		Survey sampling is both a science and an art.
		We assume that you elected to use a sample survey to permit savings in time and expense, minimize the disruption of the staff, and yet, maintain statistical representation during the project.
		The efficiency by which a survey sample is developed will depend on: internal skills in your company for data query and reporting, consolidation versus dispersion of relevant databases, data accuracy, and the extent to which there are multiple files with multiple data structures.
	www.expertss.com /sampling.html (1182 words)

	PA 765: Sampling
		In systematic sampling there is the danger of order bias: the sampling frame list may arrange subjects in a pattern, and if the periodicity of systematic sampling matches the periodicity of that pattern, the result may be the systematic over- or under-representation of some stratum of the population.
		Repeated systematic sample has the side benefit that the variability in the subsample means for a given variable is a measure of the variance of that estimate in the entire sample.
		The researcher seeks to identify variables where the sample mean deviates from the population mean, and speculates (preferably on the basis of prior literature) on the impact of such bias on the dependent variables of interest.
	www2.chass.ncsu.edu /garson/pa765/sampling.htm (4752 words)

	Questionnaire Design and Surveys Sampling
		A pilot or preliminary sample must be drawn from the population and the statistics computed from this sample are used in determination of the sample size.
		Observations used in the pilot sample may be counted as part of the final sample, so that the computed sample size minus the pilot sample size is the number of observations needed to satisfy the total sample size requirement.
		Note, incidentally, that as long as the sample is a small fraction of the total population, the actual size of the population is entirely irrelevant for the purposes of this calculation.
	home.ubalt.edu /ntsbarsh/stat-data/Surveys.htm (7163 words)

	Survey Sampling Questions
		One goal of a sample survey may be to compare two parts of a target population (these could be described as sub-populations), or a part of the population to the whole population.
		In addition, the rotating basin design could be embedded in a state wide sample survey by intensifying the sampling on the particular basin or set of basins for the year(s) that basin or set of basins was under study.
		Because survey sampling is intended to characterize the status of the resource as a whole, it is generally not useful for enumerating a list of a specific type, for example, a list of all the impaired waterbodies.
	www.epa.gov /NHEERL/arm/sursampfaqs.htm (1189 words)

	Statistical Data Analysis (Site not responding. Last check: 2007-11-06)
		In the context of survey sampling, two types of statistical inferences are available: the model-based inference and the design-based inference which exploits only the randomization entailed by the sampling process (no assumption needed about the model).
		Examining sampling distributions of sample means computed from samples of different sizes drawn from a variety of distributions, allow us to gain some insight into the behavior of the sample mean under those specific conditions as well as examine the validity of the guidelines mentioned above for using the central limit theorem in practice.
		The sample size needed for the approximation to be adequate depends strongly on the shape of the parent distribution.
	obelia.jde.aca.mmu.ac.uk /resdesgn/arsham/opre330.htm (16286 words)

	Stata Library: Survey Sampling Examples
		If a district has 30 elementary schools and you sample four of them, then your population is 30 and your sampling fraction is 4/30.
		The sampling weight which is the reciprocal of the sampling fraction.
		Another approach to sampling from the population is cluster sampling.
	www.ats.ucla.edu /stat/stata/Library/svy_survey.htm (1178 words)

	STAT 574: Survey Sampling I
		STAT 674: Survey Sampling II, is offered in the Spring semester of even numbered years.) In the first course, students will gain an overview of all aspects of designing and implementing a survey, learn how to analyze survey data and practice proper presentation of survey results.
		A two-semester sequence in survey sampling should definitely improve job prospects for those seeking a career in survey research or statistics since the demand for sampling statisticians in the Washington, D.C. area exceeds that of any other branch of statistics.
		Schaefer, Mendenhall, and Ott (1990), Elementary Survey Sampling, Duxbury.
	www.galaxy.gmu.edu /~rbolstei/STAT574.htm (1040 words)

	Survey sampling: a non-mathematical guide: Product main page
		The manual is a basic guide on survey sampling for those with little or no formal training in mathematical statistics and it is largely patterned after workshops on survey sampling.
		It is intended to explain the fundamental concepts and methods of survey sampling by way of examples and illustrations rather than by theory and algebraic expressions.
		This second edition has been expanded to include a chapter on sampling methods for telephone surveys in light of the growing prominence of these types of surveys in Canada.
	www.statcan.ca:8096 /bsolc/english/bsolc?catno=12-602-X (221 words)

	GVU's 10th WWW Survey Results (Site not responding. Last check: 2007-11-06)
		Given that the sample was selected using a random process, and each element had an equal chance of being selected for the sample, results obtained from measuring the sample can generalize to the entire population.
		Since random sampling techniques are not employed consistently though out the methodology, the ability of the collected data to generalize to the entire population is reduced, because certain members of the Web user community may not have had an equal chance to participate.
		Despite the evidence to support the Survey results, we remain unconvinced that the Survey's sampling methodology is optimal and welcome suggestions and further comments on this subject.
	www.gvu.gatech.edu /user_surveys/survey-1998-10 (2102 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		The possibility of very expensive or very atypical samples has lead to a variety of modifications such as stratified sampling, cluster sampling, and multistage sampling.
		The most experienced center in these techniques outside the Census Bureau is the University of Michigan Survey Research Center.
		They are, however, unquestionably random samples of that sizeable subgroup of the population which volunteers for opinion surveys.
	www.informationgenius.com /encyclopedia/s/su/survey_sampling_1.html (230 words)

	SurveySpot: Win cash and prizes for your opinions! (Site not responding. Last check: 2007-11-06)
		Survey Sampling International, partners with the worldâs researchers since 1977.
		Online surveys are fun and your opinions are important in helping shape the products and services of the future.
		You might win a prize or be paid a few dollars as a thank you for your time, but taking online surveys is not a way to earn a paycheck.
	www.surveyspot.com /joinus.htm (309 words)

	Questionnaire Design and Survey Sampling
		The contents of this paper are aimed at those who need to perform basic statistical analyses on data from sample surveys, especially those in marketing science.
		To give students experience of grappling with problems in the design of survey samples, the construction of data collection instruments and the management of survey projects.
		Planning and management of large scale surveys, piloting and pre testing, relations with stakeholders in the sponsored survey process, issues in survey ethics.
	www.sysurvey.com /tips/arsham.htm (4527 words)

	Aqua Survey: Vibracoring, sediment sampling, bioassays and bioaccumulation specialists.
		Aqua Survey provides a broad range of services including bioassays, sediment sampling, vibracoring, TIE's, Fate and effects testing, dredged sediment studies and bioacculation studies.
		Aqua Survey provides laboratory testing, field sampling and consulting services to a wide variety of clients throughout the world including many of the largest U.S. corporations, internationally recognized environmental consulting firms, and public sector agencies.
		The Testimonials section allows you to see what others are saying about Aqua Survey and our capabilities and the rest of the sections should be self evident.
	www.aquasurvey.com (318 words)

	Survey sampling
		With auxiliary information one can design a sampling procedure which gives more precise estimates, is less costly or makes administration of the survey simpler.
		Let the overall sample size be given, and let it be the same as you had for SI-sampling (n=97 in my case).
		Calculate the estimator of total and its variance estimator as if your SI-sample were stratified SI-sample, use your realised sample sizes in strata and your most important study variable (what we do is, in fact, poststratification, except, the variance estimator underestimates the poststratification variance estimator).
	www.helsinki.fi /~sund/sampling/comp7.html (780 words)

	Survey Sampling
		Center staff design area samples for studies involving in-person interviews and have constructed samples of telephone numbers for local, state, and national telephone interview studies, and samples from lists.
		preparing weighted population estimates from survey results; and measuring the sampling variability of survey estimates obtained from simple or complex sample designs.
		For help on sample design, the person to contact is Thomas L. Piazza, Senior Survey Statistician, piazza@csm.berkeley.edu or Yuteh Cheng, Manager of Technical Services, yuteh@hobbes.berkeley.edu.
	srcweb.berkeley.edu /surveySamplingNew.html (138 words)

	Home
		Has a good selection of surveys for UK residents which can't be said for some online survey databases.
		A lot of survey sites dont have that many surveys for UK residents - surveyhawk has it's own large section of UK survey companies.
		They have got a good selection of surveys to chose from and are always quick to respond to any little problem with great online support.
	www.ukpaidsurveys.co.uk (1580 words)

	Wiley::Survey Sampling
		An accessible book on sampling techniques with emphasis on and illustrations from surveys of human populations.
		Explains how to design and execute valid samples of moderate dimensions and difficulty, avoid selection biases and how to become more adept at evaluating sample results, judge their validity and limits of inference, applicability and precision.
		Contains numerous practical procedures, the domestic arts of sampling along with its science plus invaluable tricks that are usually learned only in apprenticeship.
	eu.wiley.com /WileyCDA/WileyTitle/productCd-0471109495.html (169 words)

	Sites Related to Survey Research
		Sample Size for Surveys is one "lecture" part of Supercourse, which "is designed to provide an overview on epidemiology and the Internet for medical and health related students around the world."
		SampleXS "is a sample size calculator for cross-sectional surveys using simple random, systematic, or complex samples."
		Sampling chapter from the Research Methods Knowledge Base, a Web-based textbook that addresses social research methods topics.
	www.srl.uic.edu /srllink/srllink.htm (659 words)

	survey sampling
		Some of the main issues we consider include: establishing whom the sample represents, using sample weights, understanding the role of other important features such as the use of sampling stratification and the selection of clustered groups of population members, as well as finding ways to analyze study data with key sampling features in mind."
		http://www.pro.gov.uk/recordsmanagement/acquisition/osp00sampling.htm specifically about sampling public records, but has info about general sampling issues too.
		http://www.respondentdrivensampling.org/ Respondent Driven Sampling is a chain-referral method, or 'snowball' sampling that yields random samples of target populations and provides the means to calculate unbiased estimates of population parameters.
	gsociology.icaap.org /methods/sampling.html (308 words)

	Statistics.com Courses: Survey Design and Sampling Procedures (Site not responding. Last check: 2007-11-06)
		Aim of the Course: This course covers the crafting of survey questions, the design of surveys, and different sampling procedures that are used in practice.
		Longstanding basic principles of survey design are covered, and the impact of the trend toward increased respondent resistance is discussed.
		The survey kit can be purchased directly from Sage Publications here.
	www.statistics.com /content/courses/surveydesign/index.html (604 words)

	Telephone Survey - Sampling, Population Coverage, and Respondent Selection
		Substance use estimates from RDD and area probability samples: impact of differential screening methods and unit nonresponse.
		Household seroprevalence survey in two high-risk Chicago neighborhoods: associations between phone in household and sexual risk behaviors and crack cocaine use.
		Polich JM, Kaelber CT. Sample surveys and the epidemiology of alcoholism.
	www.ntc.org /ntcposts/litsrchs/ts_samp.htm (1117 words)

	Home Business Directory \| Home Jobs \| Make Money Online \| Work at Home
		This is one of the best and most consistent survey sites on the internet.
		Survey Scout and its partners bring you fresh opportunities to express your opinions, participate in online focus groups, try out new products, be heard AND be paid to boot!!!
		This is a perfect opportunity for stay at home moms, students, or someone that just doesn't have time for a commute to a dead end, part time job.
	www.homebusiness-directory.biz (2011 words)

	SAGE Publications - Introduction to Survey Sampling
		Reviews sampling methods used in surveys: simple random sampling, systematic sampling, stratification, cluster and multi-stage sampling, sampling with probability proportional to size, two-phase sampling, replicated sampling, panel designs, and non-probability sampling.
		Kalton discusses issues of practical implementation, including frame problems and non-response, and gives examples of sample designs for a national face-to-face interview survey and for a telephone survey.
		He also treats the use of weights in survey analysis, the computation of sampling errors with complex sampling designs, and the determination of sample size.
	www.sagepub.com /book.aspx?pid=701 (100 words)

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