R语言做线性回归

a2.csv:
x1, x2, x3, y
tech1, tech13, pos2,0.5
tech2, tech12, pos1,0.6
tech3, tech11, pos3,0.7
tech2, tech12, pos1,0.6
tech3, tech11, pos3,0.6

my_data<-read.csv('../a2.csv')
model<-lm(y~x1+x2+x3,data=my_data)
model