Book Image

Codeless Time Series Analysis with KNIME

By : KNIME AG, Corey Weisinger, Maarit Widmann, Daniele Tonini
Book Image

Codeless Time Series Analysis with KNIME

By: KNIME AG, Corey Weisinger, Maarit Widmann, Daniele Tonini

Overview of this book

This book will take you on a practical journey, teaching you how to implement solutions for many use cases involving time series analysis techniques. This learning journey is organized in a crescendo of difficulty, starting from the easiest yet effective techniques applied to weather forecasting, then introducing ARIMA and its variations, moving on to machine learning for audio signal classification, training deep learning architectures to predict glucose levels and electrical energy demand, and ending with an approach to anomaly detection in IoT. There’s no time series analysis book without a solution for stock price predictions and you’ll find this use case at the end of the book, together with a few more demand prediction use cases that rely on the integration of KNIME Analytics Platform and other external tools. By the end of this time series book, you’ll have learned about popular time series analysis techniques and algorithms, KNIME Analytics Platform, its time series extension, and how to apply both to common use cases.
Table of Contents (20 chapters)
1
Part 1: Time Series Basics and KNIME Analytics Platform
7
Part 2: Building and Deploying a Forecasting Model
14
Part 3: Forecasting on Mixed Platforms

Time granularity and time aggregation

In this section, we will introduce the concepts of time granularity and time aggregation. We will show examples of time series with different granularities. Additionally, we will show you how to aggregate time series in KNIME. We will cover these topics in the following subsections:

  • Defining time granularity
  • Finding the right time granularity
  • Aggregating time series data

Defining time granularity

Time granularity refers to the time interval between the observations within a time series. For example, if we record a financial KPI at the end of each year, then the granularity of the time series is yearly. If a glucose monitor reports the glucose level every minute, then the granularity of the time series is by the minute. In general, time granularity can be any time interval: daily, weekly, monthly, quarterly, and more.

To illustrate how time granularity determines the dynamics of a time series, the following screenshot...