Generating new features

Analisi esplorativa dei dati in Python

George Boorman

Curriculum Manager, DataCamp

Correlation

sns.heatmap(planes.corr(numeric_only=True), annot=True)
plt.show()

Heatmap showing 0.54 Pearson correlation coefficient between Price and Duration

Viewing data types

print(planes.dtypes)

Airline                    object
Date_of_Journey    datetime64[ns]
Source                     object
Destination                object
Route                      object
Dep_Time           datetime64[ns]
Arrival_Time       datetime64[ns]
Duration                  float64
Total_Stops                object
Additional_Info            object
Price                     float64
dtype: object

Total stops

print(planes["Total_Stops"].value_counts())

1 stop      4107
non-stop    2584
2 stops     1127
3 stops       29
4 stops        1
Name: Total_Stops, dtype: int64

Cleaning total stops

planes["Total_Stops"] = planes["Total_Stops"].str.replace(" stops", "")

planes["Total_Stops"] = planes["Total_Stops"].str.replace(" stop", "")

planes["Total_Stops"] = planes["Total_Stops"].str.replace("non-stop", "0")

planes["Total_Stops"] = planes["Total_Stops"].astype(int)

Correlation

sns.heatmap(planes.corr(numeric_only=True), annot=True)
plt.show()

Heatmap showing 0.62 Pearson correlation coefficient between Price and Total Stops and 0.74 correlation between Duration and Total Stops

Dates

print(planes.dtypes)

Airline                    object
Date_of_Journey    datetime64[ns]
Source                     object
Destination                object
Route                      object
Dep_Time           datetime64[ns]
Arrival_Time       datetime64[ns]
Duration                  float64
Total_Stops                 int64
Additional_Info            object
Price                     float64
dtype: object

Extracting month and weekday

planes["month"] = planes["Date_of_Journey"].dt.month

planes["weekday"] = planes["Date_of_Journey"].dt.weekday

print(planes[["month", "weekday", "Date_of_Journey"]].head())

   month  weekday   Date_of_Journey
0      9        4        2019-09-06
1     12        3        2019-12-05
2      1        3        2019-01-03
3      6        0        2019-06-24
4     12        1        2019-12-03

Departure and arrival times

planes["Dep_Hour"] = planes["Dep_Time"].dt.hour
planes["Arrival_Hour"] = planes["Arrival_Time"].dt.hour

Correlation

Heatmap showing no relationship between datetime attributes and price

Creating categories

print(planes["Price"].describe())

count     7848.000000
mean      9035.413609
std       4429.822081
min       1759.000000
25%       5228.000000
50%       8355.000000
75%      12373.000000
max      54826.000000
Name: Price, dtype: float64

Range	Ticket Type
<= 5228	Economy
> 5228 <= 8355	Premium Economy
> 8335 <= 12373	Business Class
> 12373	First Class

Descriptive statistics

twenty_fifth = planes["Price"].quantile(0.25)

median = planes["Price"].median()

seventy_fifth = planes["Price"].quantile(0.75)

maximum = planes["Price"].max()

Labels and bins

labels = ["Economy", "Premium Economy", "Business Class", "First Class"]

bins = [0, twenty_fifth, median, seventy_fifth, maximum]

pd.cut()

Call pd-dot-cut

planes["Price_Category"] = pd.cut(

pd.cut()

Pass the data

planes["Price_Category"] = pd.cut(planes["Price"],

pd.cut()

Set the labels

planes["Price_Category"] = pd.cut(planes["Price"],
                                  labels=labels,

pd.cut()

Provide the bins

planes["Price_Category"] = pd.cut(planes["Price"],
                                  labels=labels,
                                  bins=bins)

Price categories

print(planes[["Price","Price_Category"]].head())

     Price   Price_Category
0  13882.0      First Class
1   6218.0  Premium Economy
2  13302.0      First Class
3   3873.0          Economy
4  11087.0   Business Class

Price category by airline

sns.countplot(data=planes, x="Airline", hue="Price_Category")
plt.show()

Price category by airline

Countplot showing the number of flights per airline in different price categories, with Jet Airways having the largest number of First Class tickets

Let's practice!

Analisi esplorativa dei dati in Python