Cost Estimation Model Using Modified Parameters for Construction Projects

Table 6

Validation results.

Building name	A		B		C
Method	(a)	(b)	(a)	(b)	(a)	(b)
Quantity result
Reinforced concrete	98.46	96.13	96.56	101.80	97.36	99.46
Concrete	92.49	98.91	100.95	101.08	100.05	93.94
Reinforced concrete pouring	98.46	96.13	96.56	101.80	97.36	99.46
Concrete pouring	92.49	89.91	100.95	101.08	100.50	93.94
Steel bar	86.05	76.23	99.22	113.08	101.50	105.98
Steel cutting	86.05	76.23	99.22	113.08	101.50	105.98
Basement	68.20	52.28	142.55	215.48	147.26	174.87
Column	101.40	107.65	92.09	184.53	124.85	196.76
Beam	94.98	113.91	95.30	153.38	100.97	113.21
Flat slab	96.22	98.41	101.28	105.99	96.49	104.77
Slope slab	95.88	99.91	132.26	183.94	132.26	185.21
Inner wall	97.09	96.86	101.98	102.53	101.60	103.26
Outside wall	95.10	75.99	94.23	95.60	97.41	94.46
Stair	119.16	134.36	116.55	121.50	117.38	123.78
Etc.	0.00	100.00	73.67	0.00	73.67	0.00
Average accuracy (%)	94.43	93.14	104.98	128.21	108.29	121.08
Average error rate (absolute value) (%)	5.57	6.86	4.98	28.21	8.29	21.08
Standard deviation of error rate (%)	10.89	19.62	15.01	39.33	15.87	36.12
Total cost result
Accuracy (%)	94.20	90.42	98.97	107.71	100.81	104.47
Error rate (absolute value) (%)	5.80	9.58	1.03	7.71	0.81	4.47

(a) Proposed model; (b) 1-NN method in CBR.