R实现数据处理的一个实例
发布时间：2020-12-14 03:34:30 所属栏目：大数据 来源：网络整理
导读：（1）按分数给等级 （2）按姓氏排序 options(digits=2)#限定输出小数点后数字的位数 Students-c("John Davis","Angela Williams","Bullwinkle Moose","David Jones","Janice Markhammer","Cheryl Cushing","Reuven Ytzrhak","Greg Knox","Joel England","Mar
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（1）按分数给等级 （2）按姓氏排序 options(digits=2)#限定输出小数点后数字的位数 Students<-c("John Davis","Angela Williams","Bullwinkle Moose","David Jones","Janice Markhammer","Cheryl Cushing","Reuven Ytzrhak","Greg Knox","Joel England","Mary Rayburn")Students str(Students) Math<-c(502,600,412,358,495,512,410,625,573,522) Math Science<-c(95,99,80,82,75,85,95,89,86) Science English<-c(25,22,18,15,20,28,30,27,18) English roster<-data.frame(Students,Math,Science,English,stringsAsFactors=FALSE) z<-scale(roster[,2:4])#标准化 z score<-apply(z,1,mean)?#计算综合得分 score roster<-cbind(roster,score) roster ?quantile y<-quantile(score,c(0.8,0.6,0.4,0.2)) y roster$grade[score>=y[1]]<-"A" roster$grade[score<y[1]&score>=y[2]]<-"B" roster$grade[score<y[2]&score>=y[3]]<-"C" roster$grade[score<y[3]&score>=y[4]]<-"D" roster$grade[score<y[4]]<-"E" roster name<-strsplit((roster$Students)," ") lastname<-sapply(name,"[",2) firstname<-sapply(name,1) （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |