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Sales Prediction| Importance of Sales forecasting| Using Machine Learning| End-to-End Understanding| Part -1
Latest   Machine Learning

Sales Prediction| Importance of Sales forecasting| Using Machine Learning| End-to-End Understanding| Part -1

Last Updated on July 17, 2023 by Editorial Team

Author(s): Yashashri Shiral

Originally published on Towards AI.

Sales PredictionU+007C Importance of Sales forecastingU+007C Using Machine LearningU+007C End-to-End UnderstandingU+007C Part -1

Sales Forecasting determines how the company invests and grows to create a massive impact on company valuation. In this article, you will learn how to do sales prediction using Machine Learning techniques.

Sales Forecast by CX Today

I’m diving this article into 4 parts,

Part 1- Understand what Sales Prediction/Forecasting and EDA

Part 2- Time Series model implementation

Part 3- Deep Learning model implementation(coming soon)

Part 4- Supervised Machine learning model implementation(coming soon)

Concept-

Forecasting, in simple words, means predicting or estimating future trends/making decisions based on past or present data. Forecasting is being utilized across different industries, from small businesses to large corporations, to understand customer demand so that companies can make the right decision about financial planning, customer success management, and supply chain control.

Sales Forecasting– is the process of predicting how much revenue a company, team, or person can generate within a certain timeframe. Accurate sales forecasts allow business leaders to make smarter decisions about setting goals, budgeting, hiring, prospecting, and determining how to fuel companies’ growth. So, in many ways, sales forecasting affects everyone in the organization. According to Mckinsey’s report, a global manufacturer’s demand forecasts were regularly off by 30% or more. As a result, teams rely on gut instincts to generate sales goals.

Importance of Sales Forecasting:

  1. Sales forecast allows you to spot potential issues while there’s still time to mitigate them
  2. Alignment of sales quota and revenue expectations
  3. Ability to focus a sales team on high revenue, high-profit sales pipeline opportunities, resulting in improved win rates

Why ML in sales?

As a Data Scientist, you should be able to effectively implement statistics/Machine Learning. But in real-world situations, it doesn’t stop there. Let’s say you are building an ML model to predict sales. Then one must first understand why you are doing this project, how it will impact business, and how you can improve business outcomes by building this model. If you don’t understand the business value associated with your data, it will be garbage in, garbage out of your ml model.

Now let’s understand where ML comes into the picture for sales. ML can be used in automating mundane tasks and allowing salespeople to focus their time on the most qualified opportunities. The ultimate goal is to do it more efficiently without having to invest in hiring more salespeople. In the past, most sales activities were based on the intuition of the sales rep. Machine learning is used to predict which deals will close. ML helps in predicting future trends in sales, of which one can create an interactive dashboard that would provide a single truth source to the entire organization. Sales representatives are always looking for new leads and ways to increase their sales pipeline and close more sales. Machine learning can help by providing new insights into customer behavior and patterns. ML allows businesses to create more advanced forecasting models that utilize a larger dataset with a little less human effort.

ML methods

There are two ways you can predict future sales value →

  1. Time Series model — You can implement the time series method, which comprises the use of some significant model to forecast future conclusions on the basis of known past outcomes. A time series data is a set of measurements taking place in a constant interval of time. Here, time acts as the independent variable, and the objective ( to study changes in characteristics) is the dependent variable.
  2. Supervised model — You can use a Supervised model if you extract seasonality and put it into variables. e.g., as a year, month, or day of the week, etc., along with other features which would then be used as ‘x’(dependent) variables, and ‘y’ is the actual value of the time series (in this case, sales value)
  3. Deep Learning and recent models — You can use deep models such as LSTM to predict the sales value. Or Prophet, which is developed by Facebook and is an extension of basic AR models. Instead of using lagged values of the target variable, the model provides an additional form of feature engineering.

Let’s now go through the basics of Time Series

Trendline
  1. Trend — If a time series manifests a positive long-term slope over time, it has an upward trend negative trend if it has a downtrend
  2. Seasonality — Seasonality refers to periodic fluctuations. Seasonality always has fixed frequencies. e.g., coat selling store sales go up in the winter season
  3. Stationary — A time series is said to be stationary if its properties don’t change over time i.e., it has constant mean and variance.
  4. Autocorrelation — Simply, autocorrelation is the similarity between observations as a function of the time lag between them.

Time series models

Time series models are used to forecast events based on historical data. Common types include ARIMA, smooth-based, and moving average. Not all models will yield the same results for the same dataset, so it’s critical to determine which one works best based on the individual time series.

Smoothing-based model — In time series forecasting, data smoothing is a statistical technique that involves removing outliers from the time series data set to make a pattern more visible. Smoothing data removes or reduces random variation and shows underlying trends and cyclic components.

Moving-average model — is a common approach for modeling univariate time series. The moving average specifies that the output variable depends linearly on the current and various past values. e.g. AR, MA, ARMA,ARIMA

Exponential smoothing model — is a thumb technique for smoothing time series data using the exponential window function. Exponential smoothing is an easily learned and easily applied procedure for making some determination based on prior assumptions by a user, such as seasonality. e.g. Holt-Winters method

Input Data —

I used Walmart’s weekly sales data from Kaggle to do the analysis.

Problem Statement — We want to predict the weekly sales, and we want to understand the impact of holidays or any other factors on weekly sales.

Exploratory Data Analysis —

Now let’s start understanding data first before we implement any model, which will help us choose the right model and methodology for sales prediction.

As you can see in the table, you have weekly sales and some other features which might help us understand what’s driving more sales or vice versa.

Information about input data

Let’s understand the distribution of these variables —

Distribution of Store and Department
Distribution of Weekly Sales and Temp
Distribution of CPI and Unemployment

As shown in the graphs, Weekly sales are not normally distributed.

Now let’s understand if there is any correlation between numerical variables and Sales.

Pearson Correlation

There is a low correlation between Unemployment, Temp, Fuel Price, CPI & Size with Weekly Sales. CPI/unemployment and Store/Size are negatively correlated. But Department and Size have a positive correlation with Weekly sales(not strong, though)

We have information about 81 departments, but there are a total of 99 departments.

Unique Departments

Now let’s see how these features are distributed with respect to weekly sales.

In the graph below, we can see, Weekly sales value is high for department numbers 38,40,65, 72,90,92,95.

Weekly Sales Department wise

As you can see, Type A has higher weekly sales than Type B and C.

Weekly Sales for Type

Now let’s visualize if the weekly sales go up during holidays such as the Super Bowl, Labor Day, Thanksgiving, and Christmas.

Weekly sales for holidays

We can say that whenever there are Holidays, Weekly sales go marginally up. Now let us understand which holidays drive these sales.

Weekly sales for Super Bowl
Weekly Sales for labor day
Weekly Sales for Thanksgiving
Weekly Sales for Christmas

As you can see above, only during Thanksgiving are weekly sales exceeding by some amount. It’s going down during Christmas and has almost no effect during the Super Bowl and Labor day.

Sales over the period of time —

Monthly Sales

Weekly sales are going up towards the end of the year for all three years, 2010,2011,2012.

Weekly Sales

For the understanding purpose, we are going to try all the 3 modeling approaches and will compare the results. But as seen above, features like Size, Department, Store, and Holidays have a marginal effect on Sales, it seems like the time series model or LSTM deep learning model, or supervised ML model might give better results.

Let’s understand that in Parts 2,3 and 4

Please give it a clap if you find it informative and mention in the comment if I should improve anything.

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