Quality index is the derivative index of the total index, which is expressed by relative number or average to reflect the internal relationship and contrast between phenomena. Symmetry of quantitative indicators. Indicate the attributes of things, explain the overall internal quantitative relationship and the numerical statistical indicators of the overall unit level. Its value does not increase or decrease with the size of the whole range. It represents the depth of things.
Quality index is the quality target that enterprises should achieve in all aspects of production and business activities during the planned period. It is an index that reflects the production effect or work quality of an enterprise and the utilization of social resources. Quality indicators are usually expressed in relative numbers (i.e. proportion, ratio and percentage). Such as labor productivity reflecting production or work efficiency; Output per unit area reflecting the production level; First-class product rate reflecting product quality; Repair rate and missed inspection rate of products reflecting the quality of work; The manufacturing rate of raw materials and the utilization rate of materials reflecting the utilization of raw materials; Equipment utilization rate reflecting equipment utilization rate; Reflect the cost level of product unit cost and comparable product cost reduction rate, as well as various profit margins and so on. Quality indicators can be used to analyze the effectiveness of production and operation activities of enterprises, which not only helps to discover and popularize advanced technologies, but also helps to tap the potential of various departments of enterprises. It can also find problems that quantitative indicators can not show, study and solve problems in time, and improve the production, operation and management level of enterprises.