统计学中经常结合数字的经济或社会意义，将指标划分为正指标和逆指标。正指标是指其经济和社会意义的大小和指标数值的大小成正比的指标，即所谓越大越好的指标。反之，若指标值大小与相应指标的经济和社会意义大小成反比的话，则称之为逆指标，即所谓越小越好的指标。实际上 Statistics are often combined with the economic or social significance of numbers, the indicators are divided into positive indicators and inverse indicators. Positive index refers to the size of its economic and social significance and index value is proportional to the size of the index, the so-called bigger and better indicators. On the contrary, if the value of index value is inversely proportional to the economic and social significance of the corresponding index, it is called the inverse index, which is the so-called smaller and better index. In fact