Application of Boosting Regression Trees to Preliminary Cost Estimation in Building Construction Projects

Table 1

Factors in construction cost estimation.

Description	Min.	Max	Average	Remark
Input
Budget		(1) BTL		Nominal
		(2) National finance
School levels		(1) Elementary		Nominal
		(2) Middle
		(3) High
Land acquisition		(1) Existing		Nominal
		(2) Building lots
		(3) Green belts
Class number	12	48	31	Numerical
Building area (m^2)	1,204	3,863	2,694	Numerical
Gross floor area (m^2)	4,925	12,710	9,656	Numerical
Storey	3	7	4.7	Numerical
Basement floor (storey)	0	2	0.5	Numerical
Floor Height (m)	3.3	3.6	3.5	Numerical
Output
Total construction cost; (thousand KRW)	4,334,369	14,344,867	8,288,008	Numerical