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有效度和平均无故障时间MTBF主要用于产品可靠性和型式试验，但用于测量批量产品的月度可靠性显然不适合，于是许多企业采用“反馈率”和“首次故障前平均工作时间MTTFF”来评价产品可靠性。而反馈率指某月发车台数除以在质保期内的反馈台次，MTTFF指质保期内首次发生故障的台
Validity and MTBF MTBF is primarily used for product reliability and type testing but it is clearly not appropriate to measure the monthly reliability of bulk products so many companies use “feedback rate” and “average MTTFF before first failure” To evaluate product reliability. The feedback rate refers to the number of departures in a month divided by the number of feedback in the warranty period, MTTFF refers to the first warranty during the warranty period Taiwan