Place of birth defects way to estimate the size of the internal migration.. the ongoing changes in the administrative boundaries lead to inaccuracies in data stores Birth

· Is not expected to have a simple question about the place of birth of the population, accurate answers.

· Constant changes in the administrative boundaries lead to inaccuracies in the shops Birth data.

· Conduct count the same, whether actual or count by place of residence affect the number of immigrants, the actual Valad Some might recorded on immigrants as they whereabouts on the night of the census, even though they are not.

· Place of birth data only difference between the place of birth, place of residence was found, and thus do not show the number of people who have emigrated in the period of time, and that these data do not demonstrate only direct movement between the place of birth, place of residence, so it does not show the multiple for the same individual movements.