Tiêu đề chapter-2 data science.pdf ✅

© U Dinesh Kumar, IIM Bangalore Structured and Unstructured Data  Structured data means that the data is described in a matrix form with labelled rows and columns.  Any data that is not originally in the matrix form with rows and columns is an unstructured data.

© U Dinesh Kumar, IIM Bangalore Data Type  Cross-Sectional Data: A data collected on many variables of interest at the same time or duration of time is called cross-sectional data.  Ex. Data on movies such as budget, actors, directors, genre etc.  Time Series Data: A data collected for a single variable such as demand for smartphones collected over several time intervals (weekly, monthly, etc.) is called a time series data.  Panel Data: Data collected on several variables (multiple dimensions) over several time intervals is called panel data (also known as longitudinal data).  Ex. Gross Domestic Product (GDP) data, Unemployment rate for several years