Which term is used for the initial stage of data work focused on understanding data before modeling?

Which term is used for the initial stage of data work focused on understanding data before modeling?

• A. Exploratory Data Analysis (EDA)
• B. Longitudinal (time-series) data
• C. One-Hot Encoding
• D. Categorical Data

Answer: (A)

Exploratory Data Analysis focuses on understanding the data before modeling. It involves examining distributions, identifying missing values and outliers, exploring relationships between variables, and using visualizations and summaries to build intuition about the data. This initial step guides what preprocessing, feature engineering, or transformations will be most effective when you later move to modeling. Other terms refer to data types or specific techniques rather than the initial investigative phase: longitudinal data describes time-ordered observations, one-hot encoding is a method to convert categories into binary features, and categorical data is a data type rather than a phase of data work.

Exploratory Data Analysis focuses on understanding the data before modeling. It involves examining distributions, identifying missing values and outliers, exploring relationships between variables, and using visualizations and summaries to build intuition about the data. This initial step guides what preprocessing, feature engineering, or transformations will be most effective when you later move to modeling. Other terms refer to data types or specific techniques rather than the initial investigative phase: longitudinal data describes time-ordered observations, one-hot encoding is a method to convert categories into binary features, and categorical data is a data type rather than a phase of data work.