Crossfilter and DC.js: reduce to unique number
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: In the example below, I am trying to sum by unique occurence of Respond_Id . eg. in this case, it should be in total 3 , "Respond_Id" being 258,261 and 345 . This is my data: {"Respond_Id":258,"Gender":"Female","Age":"18-21","Answer":424}, {"Respond_Id":258,"Gender":"Female","Age":"18-21","Answer":428}, {"Respond_Id":261,"Gender":"Male","Age":"22-26", "Answer":427}, {"Respond_Id":261,"Gender":"Male","Age":"22-26", "Answer":432}, {"Respond_Id":345,"Gender":"Female","Age":"27-30","Answer":424}, {"Respond_Id":345,"Gender":"Female","Age":"27-30"