Lecture 12: Advanced pandas - University of Wisconsin ...
STATS 507 Data Analysis using Python
Lecture 12: Advanced pandas
Recap
Previous lecture: basics of pandas Series and DataFrames Indexing, changing entries Function application
This lecture: more complicated operations Statistical computations Group-By operations Reshaping, stacking and pivoting
Recap
Previous lecture: basics of pandas Series and DataFrames Indexing, changing entries Function application
This lecture: more complicated operations Statistical computations Group-By operations Reshaping, stacking and pivoting
Caveat: pandas is a large, complicated package, so I will not endeavor to mention every feature here. These slides should be enough to get you started, but there's no substitute for reading the documentation.
Percent change over time
pct_change method is supported by both Series and DataFrames. Series.pct_change returns a new Series representing the step-wise percent change.
Note: pandas has extensive support for time series data, which we mostly won't talk about in this course. Refer to the documentation for more.
Percent change over time
pct_change operates on columns of a DataFrame, by default. Periods argument specifies the time-lag to use in computing percent change. So periods=2 looks at percent change compared to two time steps ago.
pct_change includes control over how missing data is imputed, how large a time-lag to use, etc. See documentation for more detail: nerated/pandas.Series.pct_change.html
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