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What does AR stand for?

AR stands for Attrition Rate

This definition appears very frequently

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We have 156 other meanings of AR in our Acronym Attic

Samples in periodicals archive:

Although it has been common to relate a new teacher's potential for staying or leaving the profession to specific external factors, a careful review of the research and literature on retention suggests that a perceived lack of efficacy, which can be defined as an internal factor, is often a cause in the attrition rates seen among new teachers.