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  2. Attrition (research) - Wikipedia

    en.wikipedia.org/wiki/Attrition_(research)

    In science, attrition are ratios regarding the loss of participants during an experiment. Attrition rates are values that indicate the participant drop out. Attrition rates are values that indicate the participant drop out.

  3. Selection bias - Wikipedia

    en.wikipedia.org/wiki/Selection_bias

    Attrition bias is a kind of selection bias caused by attrition (loss of participants), [13] discounting trial subjects/tests that did not run to completion. It is closely related to the survivorship bias , where only the subjects that "survived" a process are included in the analysis or the failure bias , where only the subjects that "failed" a ...

  4. Churn rate - Wikipedia

    en.wikipedia.org/wiki/Churn_rate

    Churn rate (also known as attrition rate, turnover, customer turnover, or customer defection) [1] 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.

  5. States with the highest rates of teacher attrition - AOL

    www.aol.com/finance/states-highest-rates-teacher...

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  6. Atlantic Data Base for Exchange Processes at the Deep Sea ...

    en.wikipedia.org/wiki/Atlantic_Data_Base_for...

    The aim of the ADEPD project was to build up a joint data base for deep sea biological and geochemical data from a variety of sources and to conduct a preliminary geographical analysis of these data. Emphasis was on the North Atlantic, since from this area most data are available and it is the most perturbed deep sea region due to human ...

  7. Attrition (erosion) - Wikipedia

    en.wikipedia.org/wiki/Attrition_(erosion)

    Rates of erosion by attrition are affected by the rocks shape, lithology, and the energy of impact, [8] therefore, softer rocks are more susceptible to attrition erosion. [9] As attrition and breakage occur on a bedrock it becomes suspended: down-stream of a river or waterway the bedload increases due to attrition.

  8. Class-size reduction - Wikipedia

    en.wikipedia.org/wiki/Class-size_reduction

    A report from the Pennsylvania State Education Association (2008) [48] noted that smaller classes improved teacher morale, which translates into higher rates of teacher attendance, reduced costs for substitute teachers and less teacher attrition.

  9. Customer attrition - Wikipedia

    en.wikipedia.org/wiki/Customer_attrition

    Customer attrition, also known as customer churn, customer turnover, or customer defection, is the loss of clients or customers.. Companies often use customer attrition analysis and customer attrition rates as one of their key business metrics (along with cash flow, EBITDA, etc.) because the cost of retaining an existing customer is far less than the cost of acquiring a new one. [1]