Six Temperature Proxies of Scots Pine from the Interior of Northern Fennoscandia Combined in Three Frequency Ranges

Table 3

Simple mean (AA) and weighted mean (WA) of all six series versus mean June–August temperatures (no filtering). The WA of RCS-based (A) and 30-year spline indexed series (B) (see also Figure 4(a)). Only test results with RE and CE > 0 are included. The WAs of those three RCS-indexed series (3RCS; 0.56 ∗ SXD + 0.44 ∗ FXD + 0.14 ∗ RRW) and four 180-year spline indexed series (4Spline; 0.22 ∗ SRW + 0.54 ∗ SXD + 0.41 ∗ FXD + 0.16 ∗ RRW) which individually passed RE and CE tests (see Table 2) versus mean June–August temperatures (C; the full models shown in Figures 4(b) and 4(c)).

	EC-LV			LC-EV
	RE	CE	𝑟^2	RE	CE	𝑟^2
(A) RCS
WA	0.55	0.55	0.67	0.21	0.21	0.53
(B) 30-year spline indexed
AA	0.56	0.56	0.57	0.50	0.50	0.51
WA	0.65	0.65	0.65	0.58	0.57	0.58
(C) WAs of selected three RCS and four 180-year spline indexed series
3RCS	0.58	0.58	0.61	0.53	0.52	0.58
4Spline	0.46	0.46	0.60	0.28	0.28	0.60