# correlated errors

1. ### 2-way4X3 Factorial ANOVA--does this require repeated measures for correlated errors ?

I am comparing different methods of estimating water use from irrigated land. I have 2 factors: Irrigation Type (a,b,c,d--these are irrigation polygons representing the various methods selected randomly in a GIS--however they are intact groups and were not assigned "treatments" at random) and...
2. ### Testing the Normality of Errors in Regression?

Hi all, I have simple conceptual question: In the simple linear regression problem, where the true relationship is, y = ax + b + e the error terms, e , are assumed to be normally distributed N(0,\sigma^2) . However, linear regression only yields estimates \alpha \approx a and \beta...
3. ### Searching for accurate specification - panel data

Hello Everyone, I am about to find best specification for my dataset. To begin with - I am trying to probe the effectivenes of the special economic zones in Poland in the meaning of growth of the economy in three similar panel data models for explained variables: a) registered unemployment...
4. ### Linear regression - when errors are correlated and from different f distributions

Hi all, This question relates to research assessing the hearing of new born babies. As mentioned in the title, I wished to solve the univariate model y = m*x + c + err, where each error term err_i comes from an F distribution, F(d1, d2), with d1 a known constant and d2 a known linear...