vam_data | R Documentation |
A simulated data set used to illustrate the functionality of the package. The data are simulated according to the VP model, and demonstrate the stability of the program in the presence of perfectly correlated future year effects.
data(vam_data)
A data frame with 3750 observations on 1250 students over 3 years, with 50 teachers in each year. The data set contains the following 5 variables.
y
a numeric vector representing the student score
student
a numeric vector
year
a numeric vector
teacher
a numeric vector
cont_var
a numeric vector representing a continuous covariate
The data set may be reproduced with the following code.
set.seed(0)
years<-3
#teacher in each year
teachers<-50
#students in each class
students<-25
alpha<-.4
eta.stu<-rnorm(students*teachers,0,5)
z1<-rep(1:teachers,each=students)
z2<-sample(rep(1:teachers,each=students))
z3<-sample(rep(1:teachers,each=students))
cont_var1<-rnorm(students*teachers,0,4)
cont_var2<-rnorm(students*teachers,0,4)
cont_var3<-rnorm(students*teachers,0,4)
gam1<- rnorm(teachers,0,5)
gam2<- rnorm(teachers,0,5)
gam3<- rnorm(teachers,0,5)
eps1<- rnorm(students*teachers,0,5)
eps2<- rnorm(students*teachers,0,5)
eps3<- rnorm(students*teachers,0,5)
y1<-eta.stu+gam1[z1]+cont_var1+eps1
y2<-eta.stu+gam1[z1]*alpha+gam2[z2]+cont_var2+eps2
y3<-eta.stu+gam1[z1]*alpha+gam2[z2]*alpha+gam3[z3]+cont_var3+eps3
student<-1:(students*teachers)
teacher<-c(z1,z2,z3)
cont_var<-c(cont_var1,cont_var2,cont_var3)
year<-c(rep(1:3,each=students*teachers))
y<-c(y1,y2,y3)
vam_data<-as.data.frame(cbind(student,teacher,year,y,cont_var))
data(vam_data) print(vam_data[1,])
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