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Regression Specification Error Test (RESET test)
Journal of the Royal Statistical Association, Series B, 71, 350–371. Reset test price on lotsize,sqrft,bdrms F statistic = 4.66820549 Critical value = 3.10789130 P-value = 0.01202171 lprice on llotsize,lsqrft,bdrms ... and cubed terms have proven to be useful in most applications. Leti denote the OLS fitted values from estimating (9.2 ...
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AR, MA and ARMA models - Hedibert
hedibert.org1) , one can rewrite a stationary AR(1) model as r t= ˚ 0 + ˚ 1r t 1 + a t; such that ˚ 1 measures the persistence of the dynamic dependence of an AR(1) time series. The ACF of the AR(1) is l= ˚ 1 l 1 l>0; where 0 = ˚ 1 1 + ˙ a 2 and l= . Also, ˆ l= ˚l 1; i.e., the ACF of a weakly stationary AR(1) series decays exponentially with rate ...
Omitted Variable Bias: The Simple Case - Hedibert
hedibert.orgIt is easy to see that Bias( ~ 1) = 0 when 1 2 = 0 The omitted variable x 2 is not in the \true" model. 2 ~ = 0 Recall that ~ is the slope from the simple regression x i2 on x i1 i= 1;:::;n; which is directly related to the correlation between x
Deterministic or Stochastic Trend? - Hedibert
hedibert.org2t with deterministic trends Even after removing a determinist trend from y 1t, the residuals still behave like a random walk. On the other hand, y 2t is de nitely trend-stationary. Modeling y1 with DT Time y1 0 50 100 150 200 0 20 40 60 80 Time Residuals 0 50 100 150 200-6-4-2 0 2 4 Noise doesn't look white 0 5 10 15 20 0.0 0.2 0.4 0.6 0.8 1.0 ...
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