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

Resampling and granularity

Time series data has its own set of common data cleansing and preprocessing steps, and these are especially important when working with IoT data. Sensors often produce data with gaps, outliers, or missing values. It’s not necessarily because sensors are less reliable than other data sources, but the sheer frequency with which we receive data points means we’re more likely to have these types of errors.

In the next few sections, we’ll recap some of the most common techniques we apply when preparing our Time Series data for analysis and modeling: aligning timestamps, correcting missing values, and aggregating.

Aligning data timestamps

The most common issue I’ve run into when analyzing IoT, specifically when plugging directly into a sensor, is irregularly spaced timestamps. For some types of analysis, this may not be a problem. Some of the methods in this chapter (mean value forecast, naïve forecast, and linear regression...