Information can be obtained from multi-level data by examining both the group-level and individual-level data matrices.

Household survey


This e-book only deals with analysis of a single data matrix. State that information in multi-level data can be transferred from one level to the other:

Select variables from the pop-up menu to see whether they are copied from the top-level data matrix to the sub-level matrix or summarised from the sub-level data matrix to the top-level one.

Explain that properly analysing multi-level data can be tricky:

Household level
The average household distance from shops is 1.5 km.
Individual level
The average individual distance from shops is 1.1 km.

These data are typical of information that is collected in surveys of consumer purchases and attitudes. A sample of houses is selected and information is collected from all individuals in these houses.