转 R 分类分析

# 1、加载包、数据准备

library(C50)
tt<-data.frame(
  x1=c(2959.19, 2459.77, 1495.63, 1046.33, 1303.97, 1730.84,
       1561.86, 1410.11, 3712.31, 2207.58, 2629.16, 1844.78,
       2709.46, 1563.78, 1675.75, 1427.65, 1783.43, 1942.23,
       3055.17, 2033.87, 2057.86, 2303.29, 1974.28, 1673.82,
       2194.25, 2646.61, 1472.95, 1525.57, 1654.69, 1375.46,
       1608.82),
  x2=c(730.79, 495.47, 515.90, 477.77, 524.29, 553.90, 492.42,
       510.71, 550.74, 449.37, 557.32, 430.29, 428.11, 303.65,
       613.32, 431.79, 511.88, 512.27, 353.23, 300.82, 186.44,
       589.99, 507.76, 437.75, 537.01, 839.70, 390.89, 472.98,
       437.77, 480.99, 536.05),
  x3=c(749.41, 697.33, 362.37, 290.15, 254.83, 246.91, 200.49,
       211.88, 893.37, 572.40, 689.73, 271.28, 334.12, 233.81,
       550.71, 288.55, 282.84, 401.39, 564.56, 338.65, 202.72,
       516.21, 344.79, 461.61, 369.07, 204.44, 447.95, 328.90,
       258.78, 273.84, 432.46),
  x4=c(513.34, 302.87, 285.32, 208.57, 192.17, 279.81, 218.36,
       277.11, 346.93, 211.92, 435.69, 126.33, 160.77, 107.90,
       219.79, 208.14, 201.01, 206.06, 356.27, 157.78, 171.79,
       236.55, 203.21, 153.32, 249.54, 209.11, 259.51, 219.86,
       303.00, 317.32, 235.82),
  x5=c(467.87, 284.19, 272.95, 201.50, 249.81, 239.18, 220.69,
       224.65, 527.00, 302.09, 514.66, 250.56, 405.14, 209.70,
       272.59, 217.00, 237.60, 321.29, 811.88, 329.06, 329.65,
       403.92, 240.24, 254.66, 290.84, 379.30, 230.61, 206.65,
       244.93, 251.08, 250.28),
  x6=c(1141.82, 735.97, 540.58, 414.72, 463.09, 445.20, 459.62,
       376.82, 1034.98, 585.23, 795.87, 513.18, 461.67, 393.99,
       599.43, 337.76, 617.74, 697.22, 873.06, 621.74, 477.17,
       730.05, 575.10, 445.59, 561.91, 371.04, 490.90, 449.69,
       479.53, 424.75, 541.30),
  x7=c(478.42, 570.84, 364.91, 281.84, 287.87, 330.24, 360.48,
       317.61, 720.33, 429.77, 575.76, 314.00, 535.13, 509.39,
       371.62, 421.31, 523.52, 492.60, 1082.82, 587.02, 312.93,
       438.41, 430.36, 346.11, 407.70, 269.59, 469.10, 249.66,
       288.56, 228.73, 344.85),
  x8=c(457.64, 305.08, 188.63, 212.10, 192.96, 163.86, 147.76,
       152.85, 462.03, 252.54, 323.36, 151.39, 232.29, 160.12,
       211.84, 165.32, 182.52, 226.45, 420.81, 218.27, 279.19,
       225.80, 223.46, 191.48, 330.95, 389.33, 191.34, 228.19,
       236.51, 195.93, 214.40),
  groups=c(2,1,2,2,4,2,2,2,2,5,2,2,2,2,2,2,2,2,2,2,2,1,3,2,2,2,2,2,2,2,2),
  row.names=c("北京","天津","河北","山西","内蒙古",
              "辽宁","吉林","黑龙江","上海","江苏","浙江",
              "安徽","福建","江西","山东","河南","湖北",
              "湖南","广东","广西","海南","重庆","四川",
              "贵州","云南","西藏","陕西","甘肃","青海" ,
              "宁夏","新疆")             
)

#2、简单随机抽样，并分割为训练、测试及对应的目标分类

set.seed(12345) #set random seed in order to repeat the result
tt <- tt[order(runif(31)),]
train <- tt[1:25,-9]
train.label <- tt[1:25,9]

#3、构建C5.0算法模型

m <- C5.0(train,train.label,trials = 10)
summary(m)   #查看分类规则

#4、交叉验证，使用测试数据集测试模型

pred <- predict(m,tt,type="class")

#5、comfusion matrix,生成混淆矩阵

mm<-table(tt$groups,pred)

#6、结果呈现

综合<-1;准确率<-1;total<-sum(diag(mm))/sum(mm)
for(i in 1:nrow(mm)) {准确率[i]<- mm[i,i]/sum(mm[i,])}
mm<-cbind(mm,准确率)
for(i in 1:ncol(mm)) {综合[i]  <- sum(mm[1:nrow(mm),i])}
mm<-rbind(mm,综合)
mm[nrow(mm),ncol(mm)]<-total
mm

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