Reduced Multivariate Polynomial Model for Manufacturing Costs Estimation of Piping Elements

Table 1

Correlation coefficients in descending order.

	Variable	Pearson coeffic.
𝑋1	Weight	0.93
𝑋2	Welding type	0.77
𝑋3	Diameter	0.71
𝑋4	Difficulty	0.68
𝑋5	Cavities	0.35
𝑋6	Class	0.10