Table 7. Spearman correlation for Male informants from Dawarian and Rati Gali, AJK, Pakistan.

Age	Number of species	d 1	Number of uses	d 2	d = d 2−d 1	d2
25	14	8	16	5	−3	9
35	9	2	4	1	−1	1
44	16	6	28	7	1	1
55	12	4	11	3	−1	1
66	7	1	10	2	1	1
85	18	7	20	6	−1	1
94	10	3	13	4	1	1

Sum of value of d² = 15 $r_{\text{c}}=1-\frac{\left[6^{\sum {\text{d}}^2}\right]}{\text{n}\left({\text{n}}^{\text{2}}-1\right)};r_{\text{c}}=1-\frac{\left[6\times 15\right]}{7\left(7^2-1\right)};r_{\text{c}}=1-\frac{\left[90\right]}{7\left(49-1\right)};r_{\text{c}}=1-\frac{\left[90\right]}{7\left(48\right)};r_{\text{c}}=1-\frac{\left[90\right]}{336}$; r_c = 1−[0.267]; r_c = 1−0.267; r_c = 0.733.