DEV Community

Cover image for Sales Trend Analysis With Pandas
AC Nice
AC Nice

Posted on

Sales Trend Analysis With Pandas

#timeseries #python #datascience #analytics

Assessment

You have just been employed as Data analyst in one of the fast growing product manufacturing and distribution companies and your first welcoming task by MD is to create a report for an upcoming board meeting. You are to go through and analyze the sales data from 2015-2017 in order to generate the requested report.

The report should capture the following;

  1. Revenue by region
  2. Revenue by sales Rep
  3. Revenue by products
  4. Sales trend
  5. Yearly changes in revenue Highlight the following on the report:
  6. Top 3 products
  7. The most productive sales Rep in the respective years. From your analysis, give 3 recommendations you think would help the company increase revenue in the following year.

Data Source:

https://docs.google.com/spreadsheets/d/1SWCOO70Yv7PPvmlLyLQj1gCilg1XsSl0/edit?usp=sharing&ouid=102731908679789782364&rtpof=true&sd=true

Github code: https://github.com/anochima/Sales-Data-Analysis



import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import seaborn as sns
Enter fullscreen mode Exit fullscreen mode 


# Setup our visuals to use seaborn by default
plt.style.use('seaborn')
plt.rcParams["figure.figsize"] = (11, 4)
Enter fullscreen mode Exit fullscreen mode 


# Import our data using pandas
df = pd.read_excel('MODULE 2-Assessment working data.xlsx')

# Convert the sales excel file into .csv (Comma Separated Value)
# This is only done because because I feel more comfortable working with Csv files to xlsx files
df = df.to_csv('sales-data.csv', index=False)

# Read the sales data
df = pd.read_csv('sales-data.csv')
Enter fullscreen mode Exit fullscreen mode 


df.head()
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Date SalesRep Region Product Color Units Revenue
0 2015-11-06 Julie East Sunshine Blue 4 78.8
1 2015-11-07 Adam West Bellen Clear 4 123.0
2 2015-11-07 Julie East Aspen Clear 1 26.0
3 2015-11-07 Nabil South Quad Clear 2 69.0
4 2015-11-07 Julie South Aspen Blue 2 51.0 


df.describe(include=['object','float','int'])
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Date SalesRep Region Product Color Units Revenue
count 9971 9971 9971 9971 9971 9971.000000 9971.000000
unique 717 6 3 7 5 NaN NaN
top 2016-09-11 Julie West Bellen Red NaN NaN
freq 77 2233 4417 1948 3020 NaN NaN
mean NaN NaN NaN NaN NaN 3.388828 91.181513
std NaN NaN NaN NaN NaN 4.320759 120.894473
min NaN NaN NaN NaN NaN 1.000000 21.000000
25% NaN NaN NaN NaN NaN 2.000000 42.900000
50% NaN NaN NaN NaN NaN 2.000000 60.000000
75% NaN NaN NaN NaN NaN 3.000000 76.500000
max NaN NaN NaN NaN NaN 25.000000 1901.750000

Some useful Insights

There was a total of 9,971 sales entries between 2015-2017 out of which the following descriptions were made:

Units:

  • The minimum number of units sold between 2015-2017 was 1
  • The maximum number of units sold between 2015-2017 was 25
  • The average number of units sold between 2015-2017 was aproximately 3

Revenue

  • The least revenue generated between 2015-2017 was 21
  • The most revenue between 2015-2017 was approximately 1902

---Others---

  • We had 6 unique Sales Representatives between 2015-2017
  • We covered 3 Regions between 2015-2017
  • 5 unique colors


# At what amount did we sell most?

df['Revenue'].value_counts().hist(bins=50);
Enter fullscreen mode Exit fullscreen mode

Image description

Here most items were sold between 21 - 70 respectively



df['Units'].hist(bins=50);
Enter fullscreen mode Exit fullscreen mode

Image description



# What's the total revenue generated between 2015-2017?

round(df['Revenue'].sum())
Enter fullscreen mode Exit fullscreen mode 
909171
Enter fullscreen mode Exit fullscreen mode 


df.info()
Enter fullscreen mode Exit fullscreen mode 
<class 'pandas.core.frame.DataFrame'>
RangeIndex: 9971 entries, 0 to 9970
Data columns (total 7 columns):
 #   Column    Non-Null Count  Dtype  
---  ------    --------------  -----  
 0   Date      9971 non-null   object 
 1   SalesRep  9971 non-null   object 
 2   Region    9971 non-null   object 
 3   Product   9971 non-null   object 
 4   Color     9971 non-null   object 
 5   Units     9971 non-null   int64  
 6   Revenue   9971 non-null   float64
dtypes: float64(1), int64(1), object(5)
memory usage: 545.4+ KB
Enter fullscreen mode Exit fullscreen mode 


# Check if we have any missing entry
df.isna().sum()
Enter fullscreen mode Exit fullscreen mode 
Date        0
SalesRep    0
Region      0
Product     0
Color       0
Units       0
Revenue     0
dtype: int64
Enter fullscreen mode Exit fullscreen mode

No entry is missing

Revenue by region 



region_revenue = pd.DataFrame(df.groupby(by=['Region'])['Revenue'].sum())
region_revenue.sort_values(ascending=False, by='Revenue')
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Revenue
Region
West 408037.58
South 263256.50
East 237876.79

Visualize region revenue impact



region_revenue.plot(kind='bar', ylabel='Revenue', title='Region revenue impact');
Enter fullscreen mode Exit fullscreen mode

Image description

It's very clear that the West Region generated the most revenue

Revenue by sales Rep 



sales_rep_revenue = df.groupby(by=['SalesRep'])['Revenue'].sum()
sales_rep_revenue = pd.DataFrame(sales_rep_revenue).sort_values(ascending=True, by='Revenue')
sales_rep_revenue
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Revenue
SalesRep
Nicole 92026.68
Adam 102715.60
Jessica 145496.28
Nabil 158904.48
Julie 204450.05
Mike 205577.78

Visualize salesRep revenue impact



sales_rep_revenue.plot(kind='bar', ylabel='Revenue', title='SalesRep revenue impact');
Enter fullscreen mode Exit fullscreen mode

Image description



print('Mike Slightly beat Julie in revenue generation by ' + str(round(((sales_rep_revenue.loc['Mike'] - sales_rep_revenue.loc['Julie']) / sales_rep_revenue.loc['Julie']) * 100, 2))+'%')
Enter fullscreen mode Exit fullscreen mode 
Mike Slightly beat Julie in revenue generation by Revenue    0.55
dtype: float64%
Enter fullscreen mode Exit fullscreen mode

Revenue by products 



product_revenue = df[['Units', 'Revenue','Product']].groupby('Product').sum().sort_values(ascending=False,by='Units')
product_revenue
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Units Revenue
Product
Bellen 6579 168175.05
Quad 6223 194032.15
Sunbell 4500 114283.09
Carlota 4371 101272.05
Aspen 4242 96382.80
Sunshine 4229 85983.80
Doublers 3646 149041.93

Visualize of Products revenue impact



product_revenue.groupby(by=['Product'])['Revenue'].sum().sort_values(ascending=True).plot(
                                                                                          kind='bar',ylabel='Revenue',title='Product Revenue');
Enter fullscreen mode Exit fullscreen mode

Image description

Sales trend 



# Convert the date column to a datetime object
df['Date'] = pd.to_datetime(df['Date'])
df['Year'] = df['Date'].dt.year
df['Month'] = df['Date'].dt.month
df['Day']  = df['Date'].dt.day
# df = df.drop('Date',axis=1)
Enter fullscreen mode Exit fullscreen mode

Plot Yearly Sales Chart/Trend 



years = [unique for unique in df.Year.unique()]
years
Enter fullscreen mode Exit fullscreen mode 
[2015, 2016, 2017]
Enter fullscreen mode Exit fullscreen mode 


def plot_trend(years:list, df):
    for year in years:
        new_df = df[df['Year'] == year]
        new_df.groupby('Date')['Revenue'].sum().plot(linewidth=1.2, 
                                             ylabel='Revenue', 
                                             xlabel='Date', 
                                             title='Sales Trend');
Enter fullscreen mode Exit fullscreen mode 


import matplotlib.patches as patches

year1 = patches.Patch(color='blue', label='2015')
year2 = patches.Patch(color='green', label='2016')
year3 = patches.Patch(color='red', label='2017')
plot_trend(years, df)
plt.legend(handles=[year1,year2,year3], loc=2);
Enter fullscreen mode Exit fullscreen mode

Image description

The trend plot looks symmetrical for the months of October in 2017 and 2018 respectively.
This shows that most sales are made within the month of October. what could have influenced this?



ax = df[['Month', 'Units', 'Revenue']].groupby('Month').sum().plot(
                                                                 title='Monthly Sales Trend', 
                                                                 ylabel='Revenue',
                                                                 );
ax.vlines(10,1,300000, linestyles='dashed')
ax.annotate('Oct',(10,0));
Enter fullscreen mode Exit fullscreen mode

Image description

How many times was entry made in each month?



df['Month'].value_counts().sort_values().plot(kind='bar', xlabel='Month', ylabel='Number of Entries', title='Monthly Entries');
Enter fullscreen mode Exit fullscreen mode

Image description



products = pd.DataFrame(df[['Units','Revenue','Product','Month', 'Region']].groupby('Month')['Product'].value_counts())
products
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Product
Month Product
1 Bellen 52
Quad 46
Sunbell 34
Aspen 33
Sunshine 33
... ... ...
12 Sunbell 43
Aspen 41
Sunshine 36
Carlota 35
Doublers 32

84 rows × 1 columns



products['No_of_products'] = products['Product']
products.drop('Product', inplace=True, axis=1)
products = products.reset_index()
Enter fullscreen mode Exit fullscreen mode 


products
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Month Product No_of_products
0 1 Bellen 52
1 1 Quad 46
2 1 Sunbell 34
3 1 Aspen 33
4 1 Sunshine 33
... ... ... ...
79 12 Sunbell 43
80 12 Aspen 41
81 12 Sunshine 36
82 12 Carlota 35
83 12 Doublers 32

84 rows × 3 columns



products = products.pivot_table(values=['No_of_products'], index=['Month'], columns=['Product'], aggfunc= np.sum)
products
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead tr th {
    text-align: left;
}

.dataframe thead tr:last-of-type th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
No_of_products
Product Aspen Bellen Carlota Doublers Quad Sunbell Sunshine
Month
1 33 52 30 29 46 34 33
2 26 45 29 25 45 35 26
3 49 55 46 34 77 35 39
4 31 37 35 27 50 43 25
5 33 52 36 30 51 37 31
6 37 53 23 21 52 30 36
7 38 60 37 25 55 46 42
8 34 54 26 35 51 35 35
9 380 596 399 311 560 397 404
10 476 735 439 333 697 491 460
11 119 154 118 77 142 108 103
12 41 55 35 32 64 43 36 


products.plot(ylabel='No of Products sold', title='Monthly product sales');
Enter fullscreen mode Exit fullscreen mode

Image description

It's clear now that we sell more Bellen during october and that and HEAVY sales kick off between September and late November

Region Monthly Revenue 



region_sales = pd.DataFrame(df[['Units','Revenue','Product','Month', 'Region']]).groupby(['Month','Region'])['Revenue'].sum()
region_sales = pd.DataFrame(region_sales)
region_sales
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Revenue
Month Region
1 East 5012.34
South 7551.55
West 8550.33
2 East 6428.75
South 5540.10
West 10864.87
3 East 6082.75
South 8863.80
West 14087.99
4 East 6420.63
South 7647.28
West 8865.57
5 East 8782.68
South 5651.30
West 10962.00
6 East 6442.85
South 3954.90
West 9020.65
7 East 7180.45
South 10155.59
West 10150.25
8 East 6031.55
South 7767.60
West 11567.37
9 East 70532.44
South 83228.39
West 127160.06
10 East 87858.60
South 92034.70
West 151780.43
11 East 19478.10
South 24048.59
West 33196.52
12 East 7625.65
South 6812.70
West 11831.54 


region_sales = region_sales.reset_index()
region_sales = region_sales.pivot_table(values=['Revenue'], index=['Month'], columns=['Region'], aggfunc= np.sum)
region_sales
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead tr th {
    text-align: left;
}

.dataframe thead tr:last-of-type th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Revenue
Region East South West
Month
1 5012.34 7551.55 8550.33
2 6428.75 5540.10 10864.87
3 6082.75 8863.80 14087.99
4 6420.63 7647.28 8865.57
5 8782.68 5651.30 10962.00
6 6442.85 3954.90 9020.65
7 7180.45 10155.59 10150.25
8 6031.55 7767.60 11567.37
9 70532.44 83228.39 127160.06
10 87858.60 92034.70 151780.43
11 19478.10 24048.59 33196.52
12 7625.65 6812.70 11831.54 


region_sales.plot(kind='bar', ylabel='Revenue', title='Region Monthly Revenue');
Enter fullscreen mode Exit fullscreen mode

Image description

Yearly changes in revenue 



changes = pd.DataFrame(df.groupby([df.Date.dt.year])['Revenue'].sum())
changes
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Revenue
Date
2015 24883.84
2016 444701.72
2017 439585.31 


changes.sort_values('Date').plot(kind='bar');
Enter fullscreen mode Exit fullscreen mode

Image description

Top 3 products 



product_revenue
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Units Revenue
Product
Bellen 6579 168175.05
Quad 6223 194032.15
Sunbell 4500 114283.09
Carlota 4371 101272.05
Aspen 4242 96382.80
Sunshine 4229 85983.80
Doublers 3646 149041.93

Our top 3 products are Bellen, Quad and Sunbell

The most productive sales Rep in the respective years. From your analysis, give 3 recommendations you think would help the company increase revenue in the following year. 



salesReps = df[['SalesRep','Year','Revenue','Units']]
salesReps = pd.DataFrame(salesReps.groupby(['Year','SalesRep'])['Revenue'].sum())
salesReps.sort_values(by=['Year','Revenue'], ascending=False)
Enter fullscreen mode Exit fullscreen mode 
.dataframe tbody tr th:only-of-type {
    vertical-align: middle;
}

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}
Enter fullscreen mode Exit fullscreen mode
Revenue
Year SalesRep
2017 Julie 99727.32
Mike 96062.19
Nabil 81079.23
Jessica 69479.74
Adam 49712.19
Nicole 43524.64
2016 Mike 104590.64
Julie 98895.58
Nabil 74576.22
Jessica 71469.42
Adam 49184.21
Nicole 45985.65
2015 Julie 5827.15
Mike 4924.95
Jessica 4547.12
Adam 3819.20
Nabil 3249.03
Nicole 2516.39

Julie Stands out in sales revenue yearly except in 2016

Conclusion/Recommendation:

  1. The best months for sales are September, October and November. The company should look into creating jingles during these periods to further maximize profit.
  2. Focus the ad targeted audience on East and South Regions
  3. Finally Bellen and Quad sell most during these periods consider getting more of them.

Top comments (0)

Read next

vincenttommi profile image

Setting Up and Exploring Django's Admin Panel

Mr #1738 -

kuhanraja_ar_1df623b8e2e profile image

python session day 2 at payilagam

Kuhanraja A R -

mikeyoung44 profile image

New Voice Command System Tackles Variable-Length Speech for Improved Live Transcription

Mike Young -

hamzakhan profile image

🛠️ Battle of the Backend: Go vs Node.js vs Python – Which One Reigns Supreme in 2024? 🚀

Hamza Khan -