পদ্ধতির তুলনা করুন

	অটো-কোরিলেশনের জন্য লাং-বক্স Q পরীক্ষা	ব্রেউশ-গডফ্রে এলএম টেস্ট ফর সিরিয়াল কোরিলেশন
ক্ষেত্র	অর্থমিতি	অর্থমিতি
পরিবার	Hypothesis test	Regression model
উদ্ভবের বছর	1978	1978
প্রবর্তক	Greta Ljung & George Box	Trevor Breusch & Leslie Godfrey
ধরন	Portmanteau goodness-of-fit test	Lagrange-multiplier test for serial correlation
মৌলিক উৎস	Ljung, G. M., & Box, G. E. P. (1978). On a measure of lack of fit in time series models. Biometrika, 65(2), 297–303.	Godfrey, L. G. (1978). Testing against general autoregressive and moving average error models when the regressors include lagged dependent variables. Econometrica, 46(6), 1293–1301.
অপর নাম	Ljung-Box Q Test, Modified Box-Pierce Test, Portmanteau Test for Autocorrelation, Otokorelasyon Portmanteau Testi	BG test, LM test for autocorrelation, Breusch-Godfrey serial correlation test, Breusch-Godfrey otokorelasyon testi
সম্পর্কিত	3	3
সারসংক্ষেপ	The Ljung-Box Q test is a diagnostic portmanteau test proposed by Ljung and Box (1978) to assess whether a group of autocorrelations in a time series residual sequence is jointly zero. It is widely used to evaluate the adequacy of fitted time series models — especially ARIMA models — by testing whether remaining residuals exhibit any systematic pattern. The test is applicable in econometrics, finance, and any field that relies on temporal data modeling.	The Breusch-Godfrey test is a Lagrange-multiplier test for serial correlation in regression residuals, developed independently by Trevor Breusch (1978) and Leslie Godfrey (1978). Unlike the Durbin-Watson test, it detects autocorrelation up to any chosen order p, remains valid when the model includes lagged dependent variables, and produces a definite chi-square p-value rather than an inconclusive region — making it the modern standard for autocorrelation testing.