Prediction of the Normalized COVID-19 Epidemic Prevention Costs of Construction Projects Based on an Optimized Neural Network

Table 3

Units and recording methods of the input variables.

Influencing factors	Units	Recording method
Project category	—	Calculate the average cost of epidemic prevention for different factors as a proportion of total investment, recorded by the number in decreasing order
Construction scale	m ^2	—
Total investment	Million	—
Construction period	Month	Calculation of construction period beyond January 2020, monthly records
Qualification of construction subject	—	Special levels (4, 3, 2, and 1) to be extrapolated
Number of managers	Person	—
Number of construction workers	Person	—
Number of local outbreaks during the construction period	Time	Record of outbreaks in cities where the project is located
Smart construction site	—	Recorded by logical value 1 not 0