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

Table 4

Weighted averages of the Swedish and Finnish density series (SXD and FXD) built using two types of indexing (RCS and 180-year splines, Sp) versus a four-month mean temperature (no filtering) from May to August (A), a five-month mean from April to August (B), and a six-month mean from April to September (C). Only test results with RE and CE > 0 are included.

	EC-LV			LC-EV
	RE	CE	𝑟^2	RE	CE	𝑟^2
RCS_A	0.55	0.54	0.56	0.55	0.55	0.57
Sp_A	0.33	0.33	0.55	0.29	0.28	0.58
RCS_B	0.49	0.48	0.50	0.49	0.48	0.51
Sp_B	0.26	0.25	0.47	0.25	0.25	0.50
RCS_C	0.44	0.43	0.45	0.53	0.52	0.53
Sp_C	0.24	0.24	0.41	0.32	0.32	0.52

Weights used in averaging: 0.51 * SXD + 0.47 * FXD (RCS_A); 0.47 * SXD + 0.42 * FXD (SP_A); 0.47 * SXD + 0.41 * FXD (RCS_B); 0.42 * SXD + 0.35 * FXD (Sp_B); 0.46 * SXD + 0.39 * FXD (RCS_C); 0.41 * SXD + 0.34 * FXD (Sp_C).