International Journal of Concrete Structures and Materials

Table 3 Correlation Cutoff important variables for the internal and external data.

From: Prediction of Stress Increase at Ultimate in Unbonded Tendons Using Sparse Principal Component Analysis

Variable	Internal data			External data
Variable	Correlation with \(\Delta f_{ps}\)	p-value	Important	Correlation with \(\Delta f_{ps}\)	p-value	Important
\(v_{ACI}\)	0.42	< 0.001	TRUE	0.77	< 0.001	TRUE
\(v_{AASHTO}\)	0.48	< 0.001	TRUE	0.57	< 0.001	TRUE
\(LT\)	0.51	< 0.001	TRUE	0.25	0.04	TRUE
\(L\)	− 0.06	0.45	FALSE	− 0.27	0.02	TRUE
\(h\)	0.28	< 0.001	TRUE	− 0.57	< 0.001	TRUE
\(b\)	− 0.17	0.02	TRUE	− 0.03	0.78	FALSE
\(d_{ps}\)	0.29	< 0.001	TRUE	0.24	0.048	TRUE
\(A_{ps}\)	− 0.51	< 0.001	TRUE	− 0.49	< 0.001	TRUE
\(f_{pu}\)	0.33	< 0.001	TRUE	− 0.22	0.07	FALSE
\(f^{\prime}_{c}\)	− 0.01	0.89	FALSE	0.52	< 0.001	TRUE
\(A_{s}\)	0.01	0.87	FALSE	− 0.53	< 0.001	TRUE
\(f_{y}\)	0.22	0.002	TRUE	− 0.23	0.054	FALSE
\(d_{s}\)	− 0.04	0.60	FALSE	− 0.14	0.26	FALSE
\(A_{s}^{'}\)	− 0.05	0.55	FALSE	− 0.35	0.003	TRUE
\(d_{s}^{'}\)	− 0.08	0.29	FALSE	− 0.14	0.25	FALSE
\(f_{pe}\)	0.06	0.46	FALSE	0.35	0.003	TRUE
\(E_{ps}\)	− 0.08	0.27	FALSE	0.09	0.44	FALSE
\(\Delta f_{ps}\)	1.00	0.00	TRUE	1.00	0.00	TRUE

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