Difference-in-Difference Regression with Fixed effect using "reg" command in Stata - by Samsun 

Thanks. The data I have used for this video is a repeated cross-sectional data. What kind of data you have? I mean, is the data cross-sectional, or repeated-cross sectional, or panel data? Please let me know, then I can explain how you can set your data.

@@Learn-Coding-with-Us thanks madam for your cooperation, actually, my data is panel data. The topic is impact of female CEOs on investment. Female CEOs is a dummy variable. Thanks

@@IrfanKhan-yg8zu is your panel data country and year wise? or state and year wise?

@@Learn-Coding-with-Us my data is firm and year wise.

my data is repeated cross-sectional data. it is good to use "xtreg" command if you have panel data

In this study, I have shown the impact of Affordable Care Act dependent coverage on health insurance coverage (HIC). The treatment variable (Treat) is constructed as a dummy variable where 1=23-25-year-old who receive dependent coverage, and 0=27-29-year-old who did not receive Affordable Care Act dependent coverage. The Affordable Care Act dependent coverage happens in 2010. So the time dummy variable (Post) indicates Post=1 if the post period of Affordable Care Act dependent coverage and Post=0 if pre-period of Affordable Care Act dependent coverage. I am so sorry, I can not make my data publicly available. But, you can watch another video on how DID model works: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qu1uPVxC5_o.html

@@Learn-Coding-with-Us Thanks mam for your response.Mam one more question what is ''state'' represents here?

@@nazmussakib816 The 51 states of the united states of america.

I have a xtset firm year when i run "xtreg diff post treat i.year , fe" it automically drop "treat" , but it doesnt drop "post"

In my video, when I run the regression, STATA dropped state1 because of collinearity.

you can run a panel fixed effect model using xtreg command in stata. Before using xtreg, you need to set Stata to handle panel data by using the command xtset. type and run: xtset firm year here, firm means the variable for firm. then type and run: xtreg (dependent variable) i.(independent variable or treatment dummy variable)## i. (Post implementation dummy or time dummy variable) other covariates, re I hope you might find the explanation helpful.

@@Learn-Coding-with-Us Mam can you help me in difference in differences.. I am using 51 states data and time 1964-2020... Seeking your help to set my data..

@@amnashaukat7827 If your data is repeated cross-sectional data like mine, you do not need to set your data. But, if it is panel data, you should set your data like: xtset state year (I am guessing)