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In the level drop-down list, select 2:school
The function shown is simply the variance of the sum of two random coefficients times
their respective explanatory variables, u0 j cons and u0 j standlrt ij , written out explicitly.
Given that cons is a vector of ones we see that the between school variance is a
quadratic function of standlrt with coefficients formed by the set of level 2 random
parameters. The intercept in the quadratic function is σ 2u0 , the linear term is 2σ u01 and
the quadratic term is σ 2u1 . We can compute this function and the Variance function
window provides us with a simple means of doing this.
The column in the window headed select, cons, standlrt and result are for computing
individual values of the variance function. Since standlrt is a continuous variable it
will be useful to calculate the level 2 variance for every value of standlrt that occurs.
In the variance output to list on the tool bar, select c30
Click Calc
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