如何重复一个过程N次？

I have:

我有：

x = rnorm(100)
# Partie b
z = rbinom(100,1,0.60)
# Partie c
y = 1.4 + 0.7*x - 0.5*z
# Partie d
x1 = abs(x)
y1 = abs(y)
Don<-cbind(y1,x1,z)

Don1 <- data.frame(Don)
Reg <- glm(y1~x1+z,family=poisson(link="log"),Don1)

# Partie e
#Biais de beta
Reg.cf <- coef(Reg)
biais0 = Reg.cf[1] - 1.4
biais1 = Reg.cf[2] - 0.7
biais2 = Reg.cf[3] + 0.5
x = rnorm(100)
# Partie b
z = r