Rows (Data Science) 편집하기

In data science, a '''row''' represents a single record or observation in a dataset. Rows, often referred to as '''examples, instances, or data points''', contain values for each feature or attribute, capturing one complete set of information in a structured format. Each row is typically analyzed as an individual unit, providing insights that contribute to broader trends or predictions when aggregated with other rows.
==Terminology==
Several terms are used interchangeably with "row" in data science:
*'''Example''': Commonly used in machine learning to refer to an individual training or test case.
*'''Instance''': Emphasizes the idea of one specific case within a dataset, often used in contexts like classification or clustering.
*'''Data Point''': A generic term indicating a single observation, frequently used in statistical analysis or visualizations.
==Structure of a Row==
Each row consists of values corresponding to different columns (features or variables). For example, in a customer dataset, each row might include values for attributes like age, gender, purchase history, and location, representing one unique customer.
==Importance of Rows in Data Analysis==
Rows, or data points, are the foundation of data analysis:
*'''Individual Insights''': Each row represents an individual case that can reveal unique patterns or anomalies, useful for identifying outliers or specific trends.
*'''Training and Testing''': In supervised learning, each row serves as an instance with both features (input variables) and a label (output variable), enabling the model to learn patterns or make predictions.
*'''Aggregation and Grouping''': Rows can be grouped and aggregated to uncover statistical patterns across different segments or groups in the data.
==Example==
Consider a dataset of loan applications. Each row (or instance) represents a single application, with columns for attributes such as applicant income, loan amount, credit score, and approval status. In this context:
*Each row corresponds to one applicant's data.
*Each row can be analyzed to predict whether similar future applicants will be approved or declined.
==Common Challenges with Rows==
Working with rows presents some challenges, particularly in large datasets:
*'''Data Quality''': Incomplete or inconsistent rows can affect the accuracy of analysis and model training.
*'''Handling Outliers''': Certain rows may contain outlier values that distort overall patterns and require special handling.
*'''Row Duplication''': Duplicate rows can skew results and often need to be removed for accurate analysis.
==Related Concepts==
Understanding rows in the context of data analysis often involves knowledge of related concepts:
*'''Columns (Features)''': Columns represent individual attributes or variables, with each row containing a value for each column.
*'''Observations vs. Attributes''': Rows are observations (instances), while columns represent attributes or characteristics of these observations.
*'''Sample vs. Population''': Rows often represent a sample used to infer patterns or trends about a larger population.
==See Also==
*[[Feature (Data Science)]]
*[[Instance]]
*[[Data Point]]
*[[Outliers]]
*[[Data Preprocessing]]
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