Data ScienceLesson 3Free preview

DS What is Data

This lesson is part of Data Science · All levels

Summary

Data can be classified based on their structural level into structured, semi-structured, and unstructured. Structured data is stored in a table, semi-structured like JSON or XML, whereas unstructured data is in the form of photos, videos, and free text. Data quality is very decisive: garbage in, garbage out.

Key points

Structured: tables with clear rows and columns (CSV, database).
Semi-structured: JSON and XML that have structural markers but not relational tables.
Unstructured: photos, videos, emails, free text documents.
A data point is a single value or observation.
Poor data quality leads to wrong conclusions.

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