. 2018 May 18;19:548–563. doi: 10.1016/j.dib.2018.05.039

Table 6.

Testing the t-value of the values of r obtained to determine whether there is a correlation or acceptable relation between the variables.

Grayscale points show that there is a correlation and acceptable relation between the parameters with the assumption of alpha α 0.05 and t (2.6877) in the first six months of 2017
$t = r \sqrt{\frac{n - 2}{1 - r^{2}}}$				1	2	3	4	5	6	7	8	9	10	11	12	13
Num	Min	Max	Ions	EC	TDS	F⁻	CL⁻	SO₄⁻²	HCO₃⁻	NO₃⁻	PO₄⁻³	Ca⁺²	Mg⁺²	Na⁺	K⁺	Fe⁺²
1	*	*	EC	*
2	*	*	TDS	*	*
3	2.80	5.96	F⁻	2.80	5.96	*
4	5.51	38.14	CL⁻	38.14	38.14	5.51	*
5	3.79	9.65	SO₄⁻²	9.65	9.65	3.79	8.03	*
6	0.077	3.28	HCO₃⁻	3.28	3.28	2.89	2.80	0.077	*
7	−0.70	1.33	NO₃⁻	0.93	0.93	−0.70	1.01	1.33	-0.62	*
8	−0.85	3.68	PO₄⁻³	1.25	1.25	3.69	1.17	0.54	1.49	−0.85	*
9	0.077	7.18	Ca⁺²	6.45	6.45	1.58	7.18	2.52	3.58	1.49	0.077	*
10	−0.778	5.66	Mg⁺²	4.84	4.84	2.61	4.59	3.79	5.66	−0.77	1.25	3.48	*
11	0.778	30.90	Na⁺	30.90	30.90	6.80	26.55	7.81	2.52	0.77	1.49	5.66	3.08	*
12	−0.54	5.10	K⁺	2.89	2.89	0.31	2.70	5.10	−0.54	0.38	0.46	1.09	3.38	1.74	*
13	−1.49	2.00	Fe⁺²	−0.977	−0.077	−0.15	−0.077	−0.23	1.91	−0.85	−1.49	0.85	2.00	−0.77	0.77	*

^* The correlation between these parameters it were 100 percent, so t-factor for these parameters is not calculate.