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Use of External information

Use of External information

Use of External information

(OP)
Hi everybody from Spain

I am starting to develop a model for a company but I have not many variables so I have thought to enhance the data with public information because is free. This public information is about socidemografic and ecomomic behaviour. The problem is this data are not at level of indivual person but at level of census section.

A census section in spain is the minor unity that public entity can give information about the behaviour of one area. More o less include between 500 and 2000 people who live in that area.

I have two question:
is there any problem if I use this data to develop my model?
is frequent to use this information to develop datamining models?

Thanks in advance

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