Compare distributions within a group, with distcomp

[Mateus Maciel]

I have the following dataset:

year   residuals
2013    -.1820623
2014    -.068333
2015    -.1602945
2016    -.3450584
2017    -.4118948
2018    
2019    
2007    
2008    
2009    .9428194
2010    .4984708
2011    .9822
2012    1.107424
2013    1.021672
2014    1.126589
2015    .5650554
2016    .181492
2017    .1412071
2018    .2174679
2019    -.0482616
2007    
2008    1.816428
2009    
2010    1.660056
2011    1.603834
2012    1.136881
2013    
2014    
2015    1.052248
2016    .9272207
2017    
2018    .6351303
2019    .5296772

I would like to check if the distribution of the residuals in a given year is different from another year. Therefore, I am running the following command:

distcomp residuals if year == 2007 | year == 2008, by(year)

However, I get this message:

year takes on 1 values, not 2

I do not understand why it is happening, because the same command worked with another analysis of residuals that I was conducting. Moreover, the variable year has more than one value.

[Mateus Maciel]

Never mind. Unfortunately, I only realized now that there were no observations for the year 2007.