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Thread: Help with First Differencing in STATA

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    Help with First Differencing in STATA




    Hello
    I am a student working with STATA for the first time. I am using panel data for the English Premier League football from 2010 to 2015 and am having trouble with first differencing my data to control for unobserved heterogeneity. Overall, I am interested in how a team's total player salary explains performance through statistics like total wins, shots, crosses, goalkeeper saves, and blocks

    I have the 10 teams I am looking at in the observations column and have set up my statistics of interest as variables distinguished by year (i.e., Wins2010, Wins2011, etc.).

    Do I need to rearrange my data in order to do first differencing in STATA or is there a way to input the function so that I have 5 dummy variables to account for the different years?

    Any help is greatly appreciated!

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    Re: Help with First Differencing in STATA


    Situations like these are almost always much easier in "long" format, see help reshape. After that you declare your data to be a time series with tsset and use the lag operator. Below is an example:

    Code: 
    clear all
    
    // some example data
    input team wins2010 wins2011 wins2012 wins2013 wins2014 wins2015
    1 1 2 3 4 5 6
    2 0 0 0 1 1 1
    3 9 9 9 9 9 9
    end
    
    // reshape
    reshape long wins , i(team) j(year)
    
    // declare time series (within teams)
    tsset team year
    
    // create differences
    gen dwins = d.wins
    
    // admire the results
    list, sepby(team)

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