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In science, attrition are ratios regarding the loss of participants during an experiment. Attrition rates are values that indicate the participant drop out. Higher attrition rates are found in longitudinal studies.
Social research is a research conducted by social scientists following a systematic plan. Social research methodologies can be classified as quantitative and qualitative.
Selection bias is the bias introduced by the selection of individuals, groups, or data for analysis in such a way that proper randomization is not achieved, thereby failing to ensure that the sample obtained is representative of the population intended to be analyzed. It is sometimes referred to as the selection effect. The phrase "selection bias" most often refers to the distortion of a statistical analysis, resulting from the method of collecting samples. If the selection bias is not taken into account, then some conclusions of the study may be false.
A cohort study is a particular form of longitudinal study that samples a cohort, performing a cross-section at intervals through time. It is a type of panel study where the individuals in the panel share a common characteristic.
Attrition may refer to
A longitudinal study is a research design that involves repeated observations of the same variables over long periods of time. It is often a type of observational study, although it can also be structured as longitudinal randomized experiment.
In medical research, social science, and biology, a cross-sectional study is a type of observational study that analyzes data from a population, or a representative subset, at a specific point in time—that is, cross-sectional data.
Churn rate is a measure of the proportion of individuals or items moving out of a group over a specific period. It is one of two primary factors that determine the steady-state level of customers a business will support.
Sensory analysis is a scientific discipline that applies principles of experimental design and statistical analysis to the use of human senses for the purposes of evaluating consumer products. The discipline requires panels of human assessors, on whom the products are tested, and recording the responses made by them. By applying statistical techniques to the results it is possible to make inferences and insights about the products under test. Most large consumer goods companies have departments dedicated to sensory analysis. Sensory analysis can mainly be broken down into three sub-sections:
An open-access poll is a type of opinion poll in which a nonprobability sample of participants self-select into participation. The term includes call-in, mail-in, and some online polls.
In medicine an intention-to-treat (ITT) analysis of the results of a randomized controlled trial is based on the initial treatment assignment and not on the treatment eventually received. ITT analysis is intended to avoid various misleading artifacts that can arise in intervention research such as non-random attrition of participants from the study or crossover. ITT is also simpler than other forms of study design and analysis, because it does not require observation of compliance status for units assigned to different treatments or incorporation of compliance into the analysis. Although ITT analysis is widely employed in published clinical trials, it can be incorrectly described and there are some issues with its application. Furthermore, there is no consensus on how to carry out an ITT analysis in the presence of missing outcome data.
The GermanSocio-Economic Panel is a longitudinal panel dataset of the population in Germany. It is a household based study which started in 1984 and which reinterviews adult household members annually. Additional samples have been taken from time to time. In 2015, there will be about 14,000 households, and more than 30,000 adult persons sampled. Some of the many topics surveyed include household composition, occupation, employment, earnings, health and life satisfaction. The annual surveys are conducted by the German Institute for Economic Research and the Kantar Group. The survey is funded by the German Federal Government and the State of Berlin via the «Bund-Länder-Kommission» for Educational Planning and Research Promotion.
Customer attrition, also known as customer churn, customer turnover, or customer defection, is the loss of clients or customers.
In statistics, missing data, or missing values, occur when no data value is stored for the variable in an observation. Missing data are a common occurrence and can have a significant effect on the conclusions that can be drawn from the data.
Oportunidades is a government social assistance program in Mexico founded in 2002, based on a previous program called Progresa, created in 1997. It is designed to target poverty by providing cash payments to families in exchange for regular school attendance, health clinic visits, and nutrition support. Oportunidades is credited with decreasing poverty and improving health and educational attainment in regions where it has been deployed. Key features of Oportunidades include:
Understanding Society, the UK Household Longitudinal Study (UKHLS), is one of the largest panel survey in the world, supporting social and economic research. Its sample size is 40,000 households from the United Kingdom or approximately 100,000 individuals.
Repeated measures design is a research design that involves multiple measures of the same variable taken on the same or matched subjects either under different conditions or over two or more time periods. For instance, repeated measurements are collected in a longitudinal study in which change over time is assessed.
Clinical trials are medical research studies conducted on human subjects. The human subjects are assigned to one or more interventions, and the investigators evaluate the effects of those interventions. The progress and results of clinical trials are analyzed statistically.
China Family Panel Studies is a nationally representative, biennial longitudinal general social survey project designed to document changes in Chinese society, economy, population, education, and health. The CFPS was launched in 2010 by the Institute of Social Science Survey (ISSS) of Peking University, China. The data were collected at the individual, family, and community levels and are targeted for use in academic research and public policy analysis. CFPS focuses on the economic and non-economic well-being of the Chinese people, and covers topics such as economic activities, educational attainment, family relationships and dynamics, migration, and physical and mental health. The themes cover social, economic, education, health and so forth.
Pathways Out of Poverty (POP) is an American workforce development program that was established on August 14, 2009 by the Obama administration and funded by the American Recovery and Reinvestment Act (ARRA) of 2009. The Department of Labor's Employment and Training Administration announced POP grantees on January 13, 2010. POP targets individuals living below or near the poverty level to provide them with skills needed to enter the green job market, focusing on the energy efficiency and renewable energy industries. The training programs focus on teaching basic literacy and job readiness skills. Some of the programs also provide supportive assistance with childcare and transportation to overcome barriers to employment.
With the application of probability sampling in the 1930s, surveys became a standard tool for empirical research in social sciences, marketing, and official statistics. The methods involved in survey data collection are any of a number of ways in which data can be collected for a statistical survey. These are methods that are used to collect information from a sample of individuals in a systematic way. First there was the change from traditional paper-and-pencil interviewing (PAPI) to computer-assisted interviewing (CAI). Now, face-to-face surveys (CAPI), telephone surveys (CATI), and mail surveys are increasingly replaced by web surveys.