How To Calculate Attrition Rate In Research. Simply put, attrition rate= no. To calculate attrition you need to divide the number of employees that left during the period by the average number of employees for the period, then multiply this figure by 100 to give you the percentage attrition rate.
Because we have different numbers of participants leaving the trial arms, the likelihood that participants in one group are not balanced. To calculate attrition rate, choose a span of time that you want to examine, like a month, quarter,. The customer attrition rate is usually measured for a defined period by dividing the number of customers lost at the end of the period by the number of customers at the start of the period.