An R Introduction to Statistics


Hierarchical Linear Model

  Linear regression probably is the most familiar technique in data analysis, but its application is often hamstrung by model assumptions. For instance, if the data has a hierarchical structure, quite often the assumptions of linear regression are feasible only at local levels. We will investigate an extension of the linear model to bi-level hierarchies.


fractal-09hA matrix is a collection of data elements arranged in a two-dimensional rectangular layout. The following is an example of a matrix with 2 rows and 3 columns.

    [         ]
      2  4  3
A =   1  5  7


A tutorial on the concept of lists in R. Discussion on list creation, retrieving list slices with the single square bracket operator, and accessing a list member directly with the double square bracket operator.