Table 8. Factor analysis for correlation differences of Bid & WTP

Classification	Hyun et al.(2020)	Park et al.(2016)	Kang et al.(2011)	Kim(2007)	Lee(2021)
Park type	Non-urban park (natural park)	Non-urban park (natural park)	Non-urban park (Arboretum)	Urban park (cultural park)	Urban park (cultural park)
Bid & WTP	-	-	-	-	+
Waterfronts	Not included	Not included	Not included	Included	Included
CVM type	Double nutrient selection	Double nutrient selection	Double nutrient selection	Double nutrient selection	Double nutrient selection
Significant variable	3 (bid, age, pros and cons)	4 (bid, inc, cont, cons)	3 (env edu, bid, inc)	3 (edu level, bid, satisfaction)	3 (bid, residence, age)
Distance from the city(km)	10.47	2.83	1.84	1.63	0.25

Note 1; 제시금액과 지불의사 관계는 '-'는 제시금액이 높아질수록 지불의사가 낮아지는 것은, '+'는 제시금액이 높아질수록 지불의사가 높아지는 것을 의미함. 도시와의 이격거리는 공원 중심부에서 밀집거주지까지의 직선거리로 산정하였음.
Note 2; env = environment, edu = education, cont = degree of contentment, inc = income, cons = effort about environment conservation, pros and cons of the tour reservation system.
Note 3; 공원의 분류는 자연공원법, 도시공원 및 녹지 등에 관한 법률에 따라 구분하였음.