GPvam (version 3.2-0)

vam_data: Simulated Data

Description

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.

Usage

data(vam_data)

Format

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

Details

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))

Examples

data(vam_data)
print(vam_data[1,])