There were several issues involved with this project that have the potential to adversely affect the validity of the conclusions.
The weights of the factors were chosen somewhat arbitrarily by making reasonable assumptions. It would have been better to study the distribution of existing Dim Sum restaurants in the region to try and determine the actual factors that influence their placement.
Some of the Census data regarding ethnic origin and language seemed inconsistent. For example, some regions had more people born in Hong Kong than people with Chinese ethnic origin. Closer examination of the data would probably be warranted.