Autocorrelation and Heteroscdascity
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Title: Autocorrelation and Heteroscdascity

Essay Details:

Subject: Business
Author: Renea H
Date: September 21, 2014
Level: University
Grade: C
Length: 2 / 482

Essay text:

Can still estimate OLS Parameters 2. OLS estimators are linear and unbiased 3. But OLS estimators are not the Best. LUE but not BLUE(best linear unbiased estimator) 4. Standard errors are high and biased 5. R2 is overestimated or inflated 6. t test, f tests are not reliable 7. The forecasts are unreliable Diagnostic: time series data usually suffer from Auto correlation Graphical Check (Step 1) Run OLS, find y?¦s and then errors et = ut Step 2) Then plot the errors Durbin-Watson Test (DW) Treatment (if positive or Negative Correlation) Increase data sample, taking log or other transformations, generalized least squares (GLS)m Prais ?V Wislen, Cochrave ?V Orcult, Hildreth Lu, Durban two step...

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