The diffusion of a new product, whose price is expected to fall progressively, is modelled as a sequence of Wars of Attrition. The likely pattern of diffusion is found to be reasonably consistent with the empirically observed S-shape.

This paper summarizes the major findings from a nonresponse bias analysis of the Early Childhood Longitudinal Study, Kindergarten Class of 1998-99 (ECLS-K) first grade data. The analysis examines the potential for bias in estimates from the ECLS-K due to attrition (nonresponse) between the base year (rounds 1 and 2) and first grade (rounds 3 and 4). This work builds on a base year nonresponse b...

The authors find that experimental studies using online samples (e.g., MTurk) often violate the assumption of random assignment, because participant attrition-quitting a study before completing it and getting paid-is not only prevalent, but also varies systemically across experimental conditions. Using standard social psychology paradigms (e.g., ego-depletion, construal level), they observed at...

BACKGROUND Panel studies offer repeated observations of individuals over time, but the mobility of populations in the developing world often causes attrition in panel studies. Such attrition can cause bias if it is selective but can be reduced by tracking respondents. Tracking in developing countries can be costly and difficult as populations are often highly mobile, infrastructure is poor, str...

During agitated drying and mixing processes, particle beds are exposed to shear deformation. This leads to particle attrition, the extent of which is dependent on the prevailing stresses and strains in the bed. The distributions of shear stresses and strain rates within the bed are highly non-uniform, requiring attention to localised conditions. Therefore a narrow angular sector of the bed is d...

There is a vast collection of scenarios where people have to time a decision optimally vis-a-vis the decision of other, examples include market entry and exit, corporate restructuring, mergers and acquisitions and so on. In economics these strategic decisions are typically studied with timing games, either tailoring the question to fit a War of Attrition(having more predecessors helps), or to a...

BACKGROUND Attrition, which is virtually ubiquitous in randomized controlled clinical trials, introduces problems of increased bias and reduced statistical power. Although likelihood-based statistical models such as mixed-effects models can accommodate incomplete data, the assumption of ignorable attrition is usually required for valid inferences. PURPOSE In an effort to make the ignorability...

Knee pain is the most frequent symptom in osteoarthritis, a condition that is the leading cause of chronic disability in the elderly and one of the main sources of morbidity attributable to osteoarthritis in general. The causes of knee pain in individuals with osteoarthritis cannot be easily understood, and the knowledge of such causes is critical for determining future specific interventions. ...

BACKGROUND A longer leukocyte telomere length (LTL) in women than men has been attributed to a slow rate of LTL attrition in women, perhaps due to high estrogen exposure during the premenopausal period. METHODS To test this premise we performed a longitudinal study (an average follow-up of 12 years) in a subset of the population-based Danish National Twin Registry. Participants consisted of 4...

BACKGROUND Knowing about predictors of attrition in a panel is important to initiate early measures against loss of participants. We investigated attrition in both early and late phase of an online panel with special focus on preferences regarding mode of participation. METHODS We used data from the HaBIDS panel that was designed to investigate knowledge, attitudes, and practice regarding inf...