| import pandas as pd | |
| def avg_3wk_spend(spend: pd.Series) -> pd.Series: | |
| """Rolling 3 week average spend.""" | |
| return spend.rolling(3).mean() | |
| def spend_per_signup(spend: pd.Series, signups: pd.Series) -> pd.Series: | |
| """The cost per signup in relation to spend.""" | |
| return spend / signups |