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Next, for the detailed and approximate components of annual and monsoon season data series from two homogenous regions (NE India and Central NE India), Sen's slopes were computed and the MK test was performed. The results of these are summarized in Table 7. It can be seen that all four approximate components had a declining trend. Furthermore, the A3 + D1 and A3 + D1 + D2 series also showed a statistically significant (all but one case) declining trend. In all the cases, Sen's slope had a high negative value.

Table 7

Key statistical change parameters for NE and central NE data series

Region and component series	Sen's slope	MK test: p- and Z-value
Region and component series	Sen's slope	p-value	Z-value
NE – Annual
A3	−6.539	0.00134	−3.208
A3 + D1	−7.296	0.0155	−2.419
A3 + D1 + D2	−7.653	0.0311	−2.155
NE – JJAS
A3	−5.534	0.383 × 10⁻⁵	−4.118
A3 + D1	−6.934	0.0005	−3.479
A3 + D1 + D2	−7.55	0.004	−2.856
Central NE – Annual
A3	−5.841	1.37 × 10⁻⁷	−5.269
A3 + D1	−5.179	0.0196	−2.335
A3 + D1 + D2	−4.622	0.0627	−1.861
Central NE – JJAS
A3	−5.482	−2.29 × 10⁻⁷	−5.174
A3 + D1	−5.219	0.0066	−2.717
A3 + D1 + D2	−5.127	0.022	−2.284

Region and component series	Sen's slope	MK test: p- and Z-value
Region and component series	Sen's slope	p-value	Z-value
NE – Annual
A3	−6.539	0.00134	−3.208
A3 + D1	−7.296	0.0155	−2.419
A3 + D1 + D2	−7.653	0.0311	−2.155
NE – JJAS
A3	−5.534	0.383 × 10⁻⁵	−4.118
A3 + D1	−6.934	0.0005	−3.479
A3 + D1 + D2	−7.55	0.004	−2.856
Central NE – Annual
A3	−5.841	1.37 × 10⁻⁷	−5.269
A3 + D1	−5.179	0.0196	−2.335
A3 + D1 + D2	−4.622	0.0627	−1.861
Central NE – JJAS
A3	−5.482	−2.29 × 10⁻⁷	−5.174
A3 + D1	−5.219	0.0066	−2.717
A3 + D1 + D2	−5.127	0.022	−2.284

Note: All component series had a falling trend.

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