One of the most important internal sources of data is the Observatory Survey, which aims at creating a profile of the type of tourist who visits Cordoba. It is based on the technique of probability sampling, in which all the samples have the same probability of being chosen.
The statistics are drawn from the pool ('population') of all the tourists who visit the city of Cordoba.
The statistical reliability has been calculated with a confidence level of 95%, a margin of error in the samples of 2.5% and a probability of 50%.
The size of the sample is dictated by these parameters and corresponds to 1,600 questionnaires completed over every three-month period.