[Retracted] Intelligent Performance Evaluation of Urban Subway PPP Project Based on Deep Neural Network Model

Table 3

Years and necessity survey.

Category	Subdivision	Proportion (%)
Number of years	Less than 1 year	25
	1-2 years	42
	2–4 years	20
	More than 4 years	13
Necessity	Very necessary	65
	More necessary	22
	Not necessary	3
	Indifferent	10