Potassium, cuprum and cobalt are found to be the key factors influencing the titer of erythromycin by co-using attribute reduction EDMAR in rough set and cluster analysis.

• 通过粗糙集理论的EDMAR属性约简算法结合聚类分析，确定钾、铜、钴是影响红霉素效价的主要因素。