Adding evolutions

Intermediate Predictive Analytics in Python

Nele Verbiest

Senior Data Scientist @PythonPredictions

Motivation for evolutions (1)

Motivation for evolutions (2)

Motivation for evolutions (3)

Motivation for evolutions (4)

Motivation for evolutions (5)

Adding evolutions to the basetable (1)

# Reference dates
start_2017 = datetime.date(2017,1,1)
start_2016 = datetime.date(2016,1,1)
start_2015 = datetime.date(2015,1,1)
# Gifts last month and last year
gifts_2016 = gifts[
   (gifts["date"]<start_2017) 
    & (gifts["date"]>=start_2016)]

gifts_2015_and_2016 = gifts[
   (gifts["date"]<start_2017) 
    & (gifts["date"]>=start_2015)]

Adding evolutions to the basetable (2)

# Number of gifts in these periods per donor
number_gifts_2016 = gifts_2016.groupby("id")["amount"].size().reset_index()
number_gifts_2016.columns = ["donor_ID", "number_gifts_2016"]

number_gifts_2015_and_2016 = 
    gifts_2015_and_2016 .groupby("id")["amount"].size().reset_index()
number_gifts_2015_and_2016.columns = ["donor_ID", "number_gifts_2015_and_2016"]

Adding evolutions to the basetable (3)

# Add these numbers to the basetable
basetable = pd.merge(basetable, 
                     number_gifts_2016, 
                     on="donor_ID",
                     how = "left")
basetable = pd.merge(basetable, 
                     number_gifts_2015_and_2016, 
                     on="donor_ID",
                     how = "left")

# Calculate ratio of last month's and last year's average
basetable["ratio_2015_to_2015_and_2016"] = 
    basetable["number_gifts_2016"] / 
    basetable["number_gifts_2015_and_2016"]

Adding evolutions to the basetable (4)

print(basetable.head())

donor_id number_gifts_2016 number_gifts_2015_and_2016 ratio_2015_to_2015_and_2016
1        Na                5                          Na
2        9                 12                         0.75
3        3                 6                          0.5

Let's practice!

Intermediate Predictive Analytics in Python