Questions tagged [variance]

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3
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1answer
1k views

Sample weights in Stata: fweight vs. pweight

I'm working with IPUMS ACS and Census data in Stata. I'm interested in learning about income distributions and variability for specific subpopulations defined by education level, occupation, race and ...
2
votes
1answer
54 views

Variance of Quantile Regression

I have been looking at quantile regression (since it is a much better method when trying to quantify welfare effects), and I am struggling with the following, standard model: $\textbf{Model:}$ $y=x'\...
0
votes
0answers
25 views

variance of error term(econometrics)

I don't understand that the pointed part(with a red circle) is a negative sign. I expect it should be a positive sign since the whole parenthesis was squared. I don't know where I got wrong.
0
votes
0answers
13 views

how to adjust price data due to clock changes?

I'm trying to analyze the hourly price variation of the electricity market. However, because of clock changes, due to daylight saving time, we have a missing hour in March and an additional hour in ...
0
votes
0answers
62 views

Covariance between regression coefficient and residual

Given regression equation Y=Xβ + ε which satisfies all classical assumptions including those of homoscadasticity Estimated regression equation using OLS is the following - Y=Xb + e Where, b is ...
0
votes
1answer
32 views

Ttest and heteroscedasticity problem in no intercept model

I was running a t test over two regression betas with the assumption of equal variance. I know that if the condition of homoscedasticity do not hold then there are chances to have type 2 error but ...
-2
votes
2answers
37 views

Why can we replace dependent variable y with the residuals e?

I don't understand why we can replace y with e: Mainly, why can we simply replace y with e, given that y is defined as: Thanks ...