Q1. Suppose that a data warehouse consists of the three dimensions time, doctor, and patient, and the two measures count and charge, where charge is the fee that a doctor charges a patient for a visit.

(a) Draw the lattice of cuboids (from apex to base cuboid) for the above data warehouse.

(b) Draw a star schema diagram for the above data warehouse. For each dimension, include the appropriate attributes (conceptual hierarchies).

(c) Starting with the base cuboid [day; doctor; patient], what specific OLAP operations (roll-up, drill down, dice, slice) should be performed (based on your schema) in order to list the total fee collected by each doctor in 2004?

(d) Assume that each dimension has four levels. How many cuboids will this cube contain? Use the equation in chapter 4.

Q2. Describe shortly in your own words the general idea of:
(a) Prediction cube.
(b) Ranking cube.