对11_1_4.csv成绩表进行主成分分析处理
setwd('D:\\data')
list.files()
#读取数据
dat=read.csv(file="11_1_4.csv",header=TRUE)
dat=dat[,-c(1,2,10,11)]
#主成分分析
PCA=princomp(dat,cor=F)
names(PCA)#查看输出项
(PCA$sdev)^2#主成分特征根
summary(PCA)#主成分贡献率
PCA$loadings#主成分载荷
PCA$scores#主成分得分
> summary(PCA)#主成分贡献率
Importance of components:
Comp.1 Comp.2 Comp.3 Comp.4 Comp.5 Comp.6 Comp.7
Standard deviation 21.923097 13.877129 11.2585833 9.08290162 7.12019143 5.87691397 5.25241336 #主成分的标准差
Proportion of Variance 0.482904 0.193489 0.1273575 0.08289078 0.05093782 0.03470209 0.02771882 #方差的贡献率
Cumulative Proportion 0.482904 0.676393 0.8037505 0.88664127 0.93757908 0.97228118 1.00000000 #方差的累积贡献率
> PCA$loadings#主成分载荷
Loadings:
Comp.1 Comp.2 Comp.3 Comp.4 Comp.5 Comp.6 Comp.7
JAVA程序设计 0.236 0.163 0.297 0.909
电子商务技术 0.623 -0.756 0.124 0.118
计算机维护与维修 0.104 0.190 -0.133 0.960
计算机组成原理 0.470 0.338 0.208 -0.306 -0.719
数据库系统原理 0.365 0.314 0.335 0.761 0.131 -0.234
算法设计与分析 0.372 0.153 -0.894 0.110 -0.105 -0.126
大学英语A_4 0.239 0.393 0.155 -0.553 0.572 -0.287 -0.221
Comp.1 Comp.2 Comp.3 Comp.4 Comp.5 Comp.6 Comp.7
SS loadings 1.000 1.000 1.000 1.000 1.000 1.000 1.000
Proportion Var 0.143 0.143 0.143 0.143 0.143 0.143 0.143
Cumulative Var 0.143 0.286 0.429 0.571 0.714 0.857 1.000
> PCA$scores#主成分得分
Comp.1 Comp.2 Comp.3 Comp.4 Comp.5 Comp.6 Comp.7
[1,] 33.3196037 17.6874355 -0.25422380 -11.2669060 4.2917495 -1.7364204 4.97518007
[2,] 31.1801767 14.1593983 -4.47470827 -7.0283584 6.4786703 -5.8908663 7.45630606
[3,] 16.0593623 4.1733395 4.73087356 3.8211303 5.0571100 -2.4575435 3.28774257
[4,] 18.4599795 6.8838756 -5.17888938 -3.5337153 -3.5324890 9.0664813 -10.53284043
[5,] 22.6257727 -5.2588625 9.25342354 -0.7271976 9.8075163 8.4440318 -2.74254542
[6,] 18.4583765 0.3841284 -5.83949272 -8.1471985 -13.7079196 -6.2410719 -3.88663198
[7,] 20.7765859 13.6381355 -1.96535180 7.0825406 11.4998414 3.8088176 -6.24709551
[8,] 22.4055982 1.2572326 -4.52725913 8.5461387 -5.8650063 3.1370173 5.43043952
[9,] 10.6507844 10.4129351 15.42304832 4.4685204 1.1673139 8.1402877 -9.46484450
[10,] 17.1639629 -2.9525391 -10.01258904 -25.4490785 -5.4754708 -13.5277187 -7.95516018
[11,] 17.7945634 8.4024604 -0.35035882 2.3099044 -10.0253564 6.9582191 2.35849100
[12,] 12.8598877 -0.5588604 12.91817330 -2.2976186 5.7661594 0.3122876 1.63729804
[13,] 17.8084340 -3.0194490 -6.51371177 2.1379239 -4.3093249 -0.2923455 -2.14479586
[14,] 10.4585027 1.0417386 -19.73650352 14.2034399 1.8029565 6.4274103 -8.10728416
[15,] 10.3192625 -4.8219566 -3.60217599 -4.0807410 9.1303336 2.1788406 -0.47648506
[16,] 19.4722336 -9.0230062 13.96055565 -3.0505762 16.4767485 -0.0768518 1.97413948
[17,] 12.4466032 3.6624606 11.86842261 -2.2940459 -5.3363913 2.9385003 12.01728038
[18,] 10.9412050 -5.2512180 12.77385227 0.1711016 5.8379586 1.8466416 -7.84034045
[19,] 20.2156694 -11.9257596 -4.89824057 4.2539217 1.2212099 -1.3598156 0.69586378
[20,] 7.5757204 1.4629122 12.45201823 1.3380320 -11.4475596 -3.0560369 -0.33679014
[21,] 2.7560708 9.2670628 12.12499946 8.2058762 -6.6679381 -1.8767783 1.75044570
[22,] 6.9386608 21.9442175 16.71159245 2.4286736 -0.8955840 -6.6829971 -4.72743757
[23,] -9.9243741 0.4757100 0.01573284 1.4254642 2.4706595 -3.8905899 2.61108720
[24,] 6.5950893 3.7321278 -8.91241929 -0.5066062 6.3637581 1.2706868 1.10666607
[25,] 16.2275862 -4.7775620 -13.76590352 -22.8140031 5.2334105 9.4658474 3.59374787
[26,] -1.6370774 16.7224036 11.47807300 1.3839942 0.1871615 -3.8104935 -2.65749127
[27,] -4.9984010 6.7262848 9.33017015 9.4159721 -11.9826050 -1.9271300 -2.70926180
[28,] -0.9466044 -4.9963382 -13.44043198 6.8435895 7.0608288 -2.0568204 -6.36663646
[29,] -6.9405262 9.3086749 -4.25783374 13.8646433 0.9253015 -12.7755734 -0.51105509
[30,] 1.7219892 -5.6298414 -10.69930010 13.6120593 -5.2090180 -10.0628742 -4.78383632
[31,] -0.3541851 12.2312177 -6.08951913 10.4920885 -7.2794460 3.1028452 4.27513314
[32,] -4.3581531 -5.9643460 -7.16475122 6.4932550 -5.1895961 -1.7878238 2.16402149
[33,] -14.4453722 -0.1044177 1.61962685 9.0343576 -2.1145786 7.1296350 6.88736228
[34,] -3.8559156 -20.4106594 2.79158832 0.3726180 -4.4280421 -0.6170102 4.28772644
[35,] 13.6221594 -7.3733618 -4.65438509 -6.9531488 -10.0671883 -0.5898709 -0.36369030
[36,] -14.2113823 -16.6100486 9.07203345 -13.4515467 -2.0797826 -3.1567749 2.94481184
[37,] -10.3241338 -21.8739290 -0.25448952 -4.2178114 -5.8253442 -2.2815638 2.57099401
[38,] -1.6878990 -13.9744770 -32.25639847 1.7264204 -6.8524217 11.0633408 4.89836794
[39,] -21.9957957 -24.0405721 22.38147318 12.4602238 0.9192234 7.6823693 0.90812105
[40,] -27.3899348 -15.4321304 13.48446066 5.0113346 -2.4836177 -4.2459026 6.84884606
[41,] -36.8582514 -10.8359097 4.53814047 -4.9203118 12.2050066 -4.2598492 -1.97133591
[42,] -29.1632178 -5.8974902 17.50675815 -13.0108622 -1.3726696 7.3525642 -1.22636356
[43,] -39.0671787 22.1658349 -3.46728792 -2.2345130 5.9431736 -8.7253538 -0.08618077
[44,] -13.5103452 -28.6644930 -6.58252140 -11.1545147 2.1688582 -4.5438992 0.97442827
[45,] -52.4375907 51.4437648 -10.05342584 -9.6192156 1.9129401 5.2524403 9.21448312
[46,] -31.0312852 -12.0406147 -21.53204798 15.8935480 14.8361158 -4.9785873 2.95657858
[47,] -73.7162166 4.2544914 -3.95079643 -10.2388023 -6.6166558 7.3302988 -12.68745922