Relationship Lab

How a series has moved with others: the correlation of daily changes (% for prices, bp for rates) over 1 and 3 years, the beta, a rolling correlation and whether one tends to move first. Correlation is not causation, and it changes over time.

KOSPI foreign net buy against…

Series	1M	3M	1Y ↓	n 1Y	3Y	3M − 3Y	Beta 1Y
KOSPI foreign net buy (cumulative since 2026-07-31) kr_foreign_cum	0.57	0.59	0.59	30	0.59	0.00	0.86	scatter
TWSE foreign net buy tw_foreign	0.64	0.57	0.57	20	0.57	0.00	0.02	scatter
Southbound net buy (cumulative since 2024-08-15) south_cum	−0.16	−0.39	−0.39	30	−0.39	0.00	−0.18	scatter
PHLX Semiconductor (SOX) sox	–	0.33	0.33	29	0.33	0.00	0.41	scatter
INDOGB 10YR id10y	−0.51	−0.32	−0.32	24	−0.32	0.00	−0.13	scatter
TWSE foreign net buy (cumulative since 2026-08-13) tw_foreign_cum	0.30	0.31	0.31	20	0.31	0.00	0.01	scatter
JCI (IHSG) jci	–	0.27	0.27	29	0.27	0.00	0.76	scatter
LQ45 lq45	–	0.24	0.24	29	0.24	0.00	0.65	scatter
UST 2YR ust2y	–	−0.20	−0.20	29	−0.20	0.00	−0.11	scatter
Gold gold	–	0.19	0.19	29	0.19	0.00	0.34	scatter
Brent brent	–	0.18	0.18	29	0.18	0.00	0.18	scatter
Southbound Stock Connect net buy south	0.22	−0.17	−0.17	30	−0.17	0.00	−0.06	scatter
USD/IDR usdidr	–	0.17	0.17	30	0.17	0.00	0.92	scatter
S&P 500 spx	–	−0.10	−0.10	29	−0.10	0.00	−0.44	scatter
DXY dxy	–	−0.10	−0.10	29	−0.10	0.00	−1.01	scatter
Nasdaq 100 ndx	–	0.09	0.09	29	0.09	0.00	0.24	scatter
Copper copper	–	−0.06	−0.06	29	−0.06	0.00	−0.13	scatter
Bitcoin btc	–	0.04	0.04	30	0.04	0.00	0.05	scatter
UST 10YR ust10y	–	0.03	0.03	29	0.03	0.00	0.02	scatter
Newcastle coal coal	–	–	–	0	–	–	–	scatter

Compared with the headline cross-asset series and the series in the same catalog category and country. Changes are matched on common dates. Beta = change in KOSPI foreign net buy per unit change in the other series (least squares, 1 year). Amber: fewer than 20 common changes (hover a value for its n). Stability: the 3-month correlation minus the 3-year one; ⇄ marks opposite signs. A change in correlation describes the past; it does not say the relationship has broken or will return. Data ↓

KOSPI foreign net buy · KOSPI foreign net buy (cumulative since 2026-07-31)

20 60 120 252

Not enough common dates for a rolling correlation.

Rolling correlation of daily changes over the last 60 common readings, last 3 years.

Who moves first? (1 year)

Lag (readings)	-10	-9	-8	-7	-6	-5	-4	-3	-2	-1	+0	+1	+2	+3	+4	+5	+6	+7	+8	+9	+10
correlation	0.34	−0.24	0.07	0.03	−0.09	−0.04	−0.10	0.06	−0.30	−0.58	0.59	0.24	−0.10	0.20	0.03	0.06	−0.06	−0.23	0.04	−0.46	−0.18

Lag +k: today's change in KOSPI foreign net buy against the change in KOSPI foreign net buy (cumulative since 2026-07-31) k readings later (positive = the first one leads). A peak away from 0 is a description of the past year only.