השוואת שיטות

	מבחן צ'או לשבר מבני	מבחן CUSUM: זיהוי חוסר יציבות פרמטרים במודלים של רגרסיה
תחום	אקונומטריקה	אקונומטריקה
משפחה	Regression model	Hypothesis test
שנת המקור	1960	1975
הוגה השיטה	Gregory C. Chow	Brown, Durbin & Evans
סוג	Test for structural break in regression coefficients	Recursive residual test
מקור מכונן	Chow, G. C. (1960). Tests of equality between sets of coefficients in two linear regressions. Econometrica, 28(3), 591–605.	Brown, R. L., Durbin, J., & Evans, J. M. (1975). Techniques for testing the constancy of regression relationships over time. Journal of the Royal Statistical Society: Series B, 37(2), 149–192.
כינויים	Chow breakpoint test, structural break test, Chow yapısal kırılma testi	Cumulative Sum Test, CUSUMSQ Test, Brown-Durbin-Evans Test, Kümülatif Toplam Testi
קשורות	2	3
תקציר	The Chow test, introduced by Gregory Chow in 1960, checks whether the coefficients of a linear regression are the same across two subsamples — that is, whether a structural break occurs at a known point such as a policy change, crisis, or regime shift. It compares the fit of a single pooled regression with the combined fit of two separate regressions; a large improvement from splitting indicates the relationship differs between the two periods or groups.	The CUSUM (Cumulative Sum) and CUSUMSQ (Cumulative Sum of Squares) tests, introduced by Brown, Durbin, and Evans (1975), assess whether the coefficients of a linear regression model remain constant over time. They are standard tools in econometrics for detecting structural breaks, policy shifts, or regime changes in time-series data without requiring prior knowledge of when a break occurs.