5 essential Pandas functions for data manipulation:

🔹 head(): Displays the first few rows of your DataFrame

🔹 tail(): Displays the last few rows of your DataFrame

🔹 merge(): Combines two DataFrames based on a key

🔹 groupby(): Groups data for aggregation and summary statistics

🔹 pivot_table(): Creates Excel-style pivot table. Perfect for summarizing data.

5 essential Python string functions:

🔹 upper(): Converts all characters in a string to uppercase.

🔹 lower(): Converts all characters in a string to lowercase.

🔹 split(): Splits a string into a list of substrings. Useful for tokenizing text.

🔹 join(): Joins elements of a list into a single string. Useful for concatenating text.

🔹 replace(): Replaces a substring with another substring. DataAnalytics

6 essential Python functions for file handling:

🔹 open(): Opens a file and returns a file object. Essential for reading and writing files

🔹 read(): Reads the contents of a file

🔹 write(): Writes data to a file. Great for saving output

🔹 close(): Closes the file

🔹 with open(): Context manager for file operations. Ensures proper file handling

🔹 pd.read_excel(): Reads Excel files into a pandas DataFrame. Crucial for working with Excel data

What 𝗠𝗟 𝗰𝗼𝗻𝗰𝗲𝗽𝘁𝘀 are commonly asked in 𝗱𝗮𝘁𝗮 𝘀𝗰𝗶𝗲𝗻𝗰𝗲 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝘀?

https://www.linkedin.com/posts/sql-analysts_what-%3F%3F-%3F%3F%3F%3F%3F%3F%3F%3F-are-commonly-asked-activity-7228986128274493441-ZIyD

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Support Vector Machines clearly explained👇


1. Support Vector Machine is a useful Machine Learning algorithm frequently used for both classification and regression problems.

⭐ this is a 𝘀𝘂𝗽𝗲𝗿𝘃𝗶𝘀𝗲𝗱 𝗹𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗮𝗹𝗴𝗼𝗿𝗶𝘁𝗵𝗺.

Basically, they need labels or targets to learn!

2. Its goal is to find a boundary that maximally separates the data into different classes (classification) or fits the data with a line/plane (regression).

They excel at handling intricate datasets where finding the right boundary seems challenging.

3. For data with non-linear relationships, finding a boundary is impossible. This boundary is called 𝘀𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗻𝗴 𝗵𝘆𝗽𝗲𝗿𝗽𝗹𝗮𝗻𝗲.

The points closest to this boundary, named 𝘀𝘂𝗽𝗽𝗼𝗿𝘁 𝘃𝗲𝗰𝘁𝗼𝗿𝘀, play a key role in shaping the SVM’s decision-making process.

4. But let’s go back to finding the boundaries...

To overcome linear limitations, SVMs take the data and project it into a higher-dimensional space, where finding the boundary becomes much easier.

This boundary is called the maximum margin hyperplane.

5. To transform the data to a higher-dimensional space, SVMs use what is called 𝗸𝗲𝗿𝗻𝗲𝗹 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀.

There are two main types:
1️⃣ Polynomial kernels
2️⃣ Radial kernels

6. 🟢 𝗔𝗗𝗩𝗔𝗡𝗧𝗔𝗚𝗘𝗦 🟢

• useful when the data is not linearly separable

• very effective in high-dimensional data and can handle a large number of features with relatively small datasets

7. 🔴 𝗗𝗜𝗦𝗔𝗗𝗩𝗔𝗡𝗧𝗔𝗚𝗘𝗦 🔴

• Sensitive to the choice of kernel function

• Sensitive to the choice of regularization parameter, which determines the trade-off between finding a good boundary and avoiding overfitting.

Common Python errors and what they mean:

🔹 SyntaxError: Incorrectly written code structure. Check for typos or missing punctuation (like missing '';,).

🔹 IndentationError: Inconsistent use of spaces and tabs. Keep your indentation consistent.

🔹 TypeError: Performing an operation on incompatible types. Like adding a string and an integer ⤵️
🔹 NameError: Using a variable or function that hasn't been defined. Like print(undeclared_variable)

🔹 ValueError: Function receives the correct type but an inappropriate value. When you are trying to convert str to ing, like int("abc")

How to choose your data science career 👇👇
https://www.linkedin.com/posts/sql-analysts_best-courses-on-data-science-ai-1-data-activity-7229345999612239872-NRcf?utm_source=share&utm_medium=member_android

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Data Analyst vs. Data Scientist 👇👇
https://news.1rj.ru/str/sqlspecialist/775

Guesstimate questions are scary, simply because they really matter for impacting your performance in those all-important interviews — often for consulting, data analytics or product management. No need to worry; you can do it! In this guide, we are looking at how to approach guesstimate questions with confidence and make what sounds like a guessing game into an opportunity for showcasing our analytical thinking
👇👇
https://datasimplifier.com/guesstimate-questions/

5 Python functions for statistical analysis:

🔹 mean(): Calculates the average of your data. Perfect for understanding central tendencies.

🔹 median(): Finds the middle value in your data. Useful when your data has outliers.

🔹 mode(): Identifies the most frequent value. Key for categorical data analysis.

🔹 std(): Computes the standard deviation. Crucial for measuring data dispersion.

🔹 var(): Calculates the variance. Helps in understanding data variability. DataAnalytics