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Stata Help Professionals offers free help in use of Stata for Data Analysis, Stata for Econometrics, Stata for Statistics and Stata for Quantitative Analysis. Join us and ask a professional to help you for free or order a custom help for intensive analytics and data analysis using Stata. We only deal with offers in Stata specifically here and you can consult our core workshop at Econometricians Club page for further details.

30/06/2017
Q: Why some coefficients are usually dropped in Stata output? Ans: Because of collinearity among regressors.
25/12/2016

Q: Why some coefficients are usually dropped in Stata output? Ans: Because of collinearity among regressors.

03/12/2016
29/08/2016

Let us load an example data in Stata. Remove the codeline: before running the codes in codelines.
codeline: sysuse auto, clear
Now describe the structure of the data. It will show
codeline: describe
The following code takes observation of variable: rep78 one by one, calculate the median for each selection of the group of observations of price variable and computes its median
codeline: by rep78, sort: egen medprice = median(price)
The following codeline to generate the difference of the price values and the media of price calculated in groups by rep78.
codeline: generate deltaprice = price - medprice
This tabulates the produced data to see the >medprice and

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