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Study Note54

Library (Pandas, Seaborn, Matplotlib, Numpy) - Iris Data When using Python, in addition to basic functions, we need to utilize various libraries. Especially, Pandas, Seaborn, Matplotlib, and Numpy are the most essential libraries when performing data analysis.  1. Pandas:   - Purpose: Pandas is used for data manipulation and analysis. It provides data structures to efficiently store and manipulate data. Its main data structures are Series (a one-dimen.. 2024. 5. 14.
The Pearson correlation coefficient The Pearson correlation coefficient is a statistical method used to measure the linear relationship between two variables. It typically describes how two variables move together. The Pearson correlation coefficient ranges from -1 to 1, and it is interpreted as follows:- Close to 1: Indicates a strong positive linear relationship between the two variables. As one variable increases, the other var.. 2024. 5. 13.
Data preprocessing Data preprocessing refers to the process of cleaning, transforming, and preparing data before it is analyzed. This process involves improving the quality of the data and transforming it into a suitable format for analysis, thereby enhancing the performance of analytical models. The main tasks involved in data preprocessing include:1. Data Cleaning: This involves removing noise from the data, suc.. 2024. 5. 10.
What is Data Analyst? What is Data Analyst?A data analyst is a professional who primarily collects and analyzes data to derive useful information and insights.They typically perform the following tasks:1. Data Collection: They gather data from various sources and store it in databases or data warehouses.2. Data Preprocessing: They refine and standardize collected data to prepare it for analysis, including data cleani.. 2024. 5. 9.
Enumerate() The `enumerate()` function  takes an iterable object (such as a list, tuple, or string) as input and is used to iterate over it while keeping track of the index and the corresponding element. It's commonly used in for loops when you need to access both the index and the element of each iteration.The syntax of the `enumerate()` function is as follows:enumerate(iterable, start=0) - `iterable`: The.. 2024. 5. 8.
DML, TCL, DDL, DLC 1. Data Manipulation Language (DML):   - DML is used to manipulate data in a database, including querying, inserting, updating, and deleting data.   - Common DML commands include SELECT, INSERT, UPDATE, and DELETE.   - It allows users to interact with and manage data in the database.   - For example, the SELECT statement retrieves data from tables, INSERT inserts new records into a table, UPDATE.. 2024. 5. 7.

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