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Predicting new prices

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Hi all,

I'm investigating the relationship between property prices and distance from the airport/number of flights in that airport. I have data on Gatwick and Heathrow, and I now want to predict new prices if the number of flights was to increase. In the Heathrow case there would be a 56% increase in number of flights while for Gatwick it's 113% more (it more than doubles).

This is what I did so far:
Code:
replace flights_heat=flights_heat*1.56
Code:
predict price_heat
And I get a good 30% decrease in prices (calculating the difference between the average of old prices and the average of the new prices).

BUT when I try it for Gatwick, using
Code:
replace flights_gat=flights_gat*2.13
Code:
predict price_gat
I get the exact same result as for Heathrow.

I've tried doing Gatwick first, but I get always the same result. I think it's weird that price for both decrease by the same amount.
What I am doing wrong?

Thanks,

Eleonora

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