​$$CER=\frac{\Sigma P}{\Sigma D}\times 1000$$​​

​$$CDR=\frac{\Sigma P}{\Sigma D}\times 100$$​​

​$$CER=\frac{\Sigma D}{\Sigma P}\times 1000$$​​

​$$CDR=\frac{\Sigma D}{\Sigma P}\times 1000$$​​