Limitations and conclusion
The results of our tests show that while these noise complaint data are stationary overall, they are not stationary for certain complaint types within Gowanus. The top Descriptor for "Noise - Commercial" is "Loud Music/Partying." This could mean that as the neighborhood gentrified, there have been more loud parties that disturb residents.
However, all it really means for sure is that more people are calling about the loud parties. This brings up an interesting limitation of this study, that gets at the core of our original question: there is known bias in 311 reporting, including studies that investigate the ratio of reports to actual violations\cite{pk6zdd}. Although it's hard to draw concrete conclusions from the data due to its bias, we can still use this data driven anecdote to support "there goes the neighborhood" claims.
Next steps on this project would be to investigate if there are any points of change (areas that deviate over 3 sigma from the mean), and two sample KS Tests to look at commercial noise in particular to see if they come from the same distributions the larger Brooklyn.