Search results for "Non-response bias"

showing 3 items of 3 documents

Non-response bias as a likely cause of the association between young maternal age at the time of delivery and the risk of cancer in the offspring.

2003

Some epidemiological studies have shown an association between young maternal age at the time of delivery and risk of cancer in the offspring. In a recent German case-control study, there was a twofold increase in the leukaemia risk for children whose mothers were aged < 20 years at the time of delivery. As the prevalence of younger mothers among control families was particularly low, data on maternal age distributions for the general population of Germany were obtained in order to examine the representativeness of the control sample. Despite the excellent sampling frame based on data from complete and up-to-date population registries and a satisfactory response rate among controls ( approx…

RiskPediatricsmedicine.medical_specialtyEpidemiologyOffspringPopulationCentral Nervous System NeoplasmsNeuroblastomaBiasEpidemiologyMedicineHumansNon-response biaseducationSampling frameResponse rate (survey)education.field_of_studybusiness.industryLymphoma Non-HodgkinCase-control studyInfant NewbornPrecursor Cell Lymphoblastic Leukemia-LymphomaSample size determinationCase-Control StudiesSample SizePediatrics Perinatology and Child HealthFemalebusinessDemographyMaternal AgePaediatric and perinatal epidemiology
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Encuestas a pie de urna en España. ¿Error muestral o sesgo de no respuesta?

2016

Countless examples of misleading forecasts on behalf of both pre-election and exit polls can be found all over the world. Non-representative samples due to differential nonresponse have been claimed as being the main reason for inaccurate exit-poll projections. In real inference problems, it is seldom possible to compare estimates and true values. Electoral forecasts are an exception. Comparisons between estimates and final outcomes can be carried out once votes have been tallied. In this paper, we examine the raw data collected in seven exit polls conducted in Spain and test the likelihood that the data collected in each sampled voting location can be considered as a random sample of actua…

Spanish regional electionsmedia_common.quotation_subjectlcsh:HM401-1281InferenceContext (language use)01 natural sciencesPredicciones en la noche electoral010104 statistics & probabilityElecciones regionales españolasnonresponseVoting050602 political science & public administrationEconometricsEconomicsNon-response biasQuality (business)0101 mathematicsNo-respuestamedia_commonElection night forecasts05 social sciencesGeneral Social SciencesDifferential (mechanical device)Error de medida0506 political scienceTest (assessment)lcsh:Sociology (General)Distribución multi-hipergeométricaRaw datameasurement errormulti-hypergeometric distributionRevista Internacional de Sociología
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Improving predictive accuracy of exit polls

2010

Abstract Exit polls are best known for their use in election forecasting. In recent years, however, some prominent mistaken predictions have been made, undermining public confidence in the accuracy of both exit polls and survey methods. Nonresponse bias has been claimed as being one of the main reasons for inaccurate projections. Traditionally, the issue has been handled through an age–race–sex adjustment at the national and state levels. An alternative solution is suggested and detailed in this paper. A two-step strategy is proposed to reduce nonresponse bias and improve predictions. First, “vote-remembering” (vote recall) is used to correct party proportion estimates at polling locations;…

Survey methodologyComputer scienceVotingmedia_common.quotation_subjectPrecinctPublic confidenceEconometricsSurvey samplingNon-response biasBusiness and International ManagementPollingRaw datamedia_commonInternational Journal of Forecasting
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