Answer:
The answer is: probability approach: Research estimate QALYs in a number of different ways; one popular approach is called the probability approach.
Step-by-step explanation:
The probability approach is very popular and appropriate for estimating Quality-Adjusted Life Year (QALY) which is an assessment of the quality of health outcomes, as expressed by an index number; it is based on the assumption that health depends on the quality and span of life. The probability approach best evaluates the likelihood of occurrence of various indices of QALY.