Data Science & Machine Learning
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๐—ฆ๐—ฏ๐—ฒ๐—ฟ๐Ÿฑ๐Ÿฌ๐Ÿฌ ๐—•๐—ฎ๐˜๐—ฐ๐—ต ๐Ÿณ โ€” ๐—™๐—ฟ๐—ฒ๐—ฒ ๐—”๐—ฐ๐—ฐ๐—ฒ๐—น๐—ฒ๐—ฟ๐—ฎ๐˜๐—ผ๐—ฟ ๐—ณ๐—ผ๐—ฟ ๐—”๐—œ & ๐——๐—ฒ๐—ฒ๐—ฝ๐—ง๐—ฒ๐—ฐ๐—ต ๐—ฆ๐˜๐—ฎ๐—ฟ๐˜๐˜‚๐—ฝ๐˜€ ๐Ÿš€

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๐Ÿ’ฌ Language: English

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โœ… Data Cleaning in Pandas ๐Ÿ๐Ÿงน

๐Ÿ‘‰ In real projects, 80% of the work = Data Cleaning

Because raw data is always messy ๐Ÿ˜…

๐Ÿ”น 1. Why Data Cleaning?

Real-world data may have:
โŒ Missing values
โŒ Duplicate records
โŒ Wrong formats
โŒ Extra spaces

๐Ÿ‘‰ Cleaning makes data usable for analysis & ML.

๐Ÿ”ฅ 2. Handling Missing Values

โœ… Check Missing Values

df.isnull()
df.isnull().sum()

โœ… Remove Missing Values
df.dropna()

โœ… Fill Missing Values
df.fillna(0)

๐Ÿ‘‰ Replace missing values with 0 or mean.

๐Ÿ”น 3. Remove Duplicates

df.drop_duplicates()

๐Ÿ”น 4. Rename Columns

df.rename(columns={"Name": "Full_Name"}, inplace=True)

๐Ÿ”น 5. Change Data Types

df["Age"] = df["Age"].astype(int)

๐Ÿ”น 6. Remove Extra Spaces

df["Name"] = df["Name"].str.strip()

๐Ÿ”น 7. Replace Values

df["City"] = df["City"].replace("NY", "New York")

๐Ÿ”น 8. Why This is Important?
โœ” Clean data = better insights
โœ” Clean data = better ML models
โœ” Used in every real-world project

๐ŸŽฏ Todayโ€™s Goal
โœ” Handle missing values
โœ” Remove duplicates
โœ” Fix data types
โœ” Clean text data

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Freshers are getting paid 10 - 15 Lakhs by learning AI & ML skill

๐Ÿ“ข ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—”๐—น๐—ฒ๐—ฟ๐˜ โ€“ ๐—”๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ถ๐—ฎ๐—น ๐—œ๐—ป๐˜๐—ฒ๐—น๐—น๐—ถ๐—ด๐—ฒ๐—ป๐—ฐ๐—ฒ ๐—ฎ๐—ป๐—ฑ ๐— ๐—ฎ๐—ฐ๐—ต๐—ถ๐—ป๐—ฒ ๐—Ÿ๐—ฒ๐—ฎ๐—ฟ๐—ป๐—ถ๐—ป๐—ด

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โค3๐Ÿค”2๐Ÿ‘1
Which library is used for basic plotting in Python?
Anonymous Quiz
8%
A) NumPy
7%
B) Pandas
82%
C) Matplotlib
3%
D) TensorFlow
โค4๐Ÿ‘1
Which function is used to display a plot?
Anonymous Quiz
9%
A) showplot()
6%
B) display()
30%
โค6
What type of chart is best for showing trends over time?
Anonymous Quiz
17%
A) Bar chart
8%
B) Pie chart
56%
C) Line chart
20%
D) Histogram
โค2๐Ÿ‘1
Which library is used for advanced and attractive visualizations?
Anonymous Quiz
25%
A) Matplotlib
63%
B) Seaborn
7%
C) NumPy
5%
D) SciPy
โค2
๐—ง๐—ผ๐—ฝ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐˜๐—ผ ๐—Ÿ๐—ฎ๐—ป๐—ฑ ๐—ฎ ๐—›๐—ถ๐—ด๐—ต-๐—ฃ๐—ฎ๐˜†๐—ถ๐—ป๐—ด ๐—๐—ผ๐—ฏ ๐—ถ๐—ป ๐Ÿฎ๐Ÿฌ๐Ÿฎ๐Ÿฒ๐Ÿ”ฅ

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โค1
โœ… Data Science Interview Prep Guide ๐Ÿ“Š๐Ÿง 

Whether you're a fresher or career-switcher, hereโ€™s how to prep step-by-step:

1๏ธโƒฃ Understand the Role
Data scientists solve problems using data. Core responsibilities:
โ€ข Data cleaning & analysis
โ€ข Building predictive models
โ€ข Communicating insights
โ€ข Working with business/product teams

2๏ธโƒฃ Core Skills Needed
โœ”๏ธ Python (NumPy, Pandas, Matplotlib, Scikit-learn)
โœ”๏ธ SQL
โœ”๏ธ Statistics & probability
โœ”๏ธ Machine Learning basics
โœ”๏ธ Data storytelling & visualization (Power BI / Tableau / Seaborn)

3๏ธโƒฃ Key Interview Areas

A. Python & Coding
โ€ข Write code to clean and analyze data
โ€ข Solve logic problems (e.g., reverse a list, group data by key)
โ€ข List vs Dict vs DataFrame usage

B. Statistics & Probability
โ€ข Hypothesis testing
โ€ข p-values, confidence intervals
โ€ข Normal distribution, sampling

C. Machine Learning Concepts
โ€ข Supervised vs unsupervised learning
โ€ข Overfitting, regularization, cross-validation
โ€ข Algorithms: Linear Regression, Decision Trees, KNN, SVM

D. SQL
โ€ข Joins, GROUP BY, subqueries
โ€ข Window functions
โ€ข Data aggregation and filtering

E. Business & Communication
โ€ข Explain model results to non-tech stakeholders
โ€ข What metrics would you track for [business case]?
โ€ข Tell me about a time you used data to influence a decision

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โ€ข Kaggle (competitions & notebooks)

๐Ÿ’ฌ Tap โค๏ธ for more!
โค14๐Ÿ‘1
๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€, ๐——๐—ฎ๐˜๐—ฎ ๐—ฆ๐—ฐ๐—ถ๐—ฒ๐—ป๐—ฐ๐—ฒ ๐˜„๐—ถ๐˜๐—ต ๐—”๐—œ ๐—ฎ๐—ฟ๐—ฒ ๐—ต๐—ถ๐—ด๐—ต๐—น๐˜† ๐—ฑ๐—ฒ๐—บ๐—ฎ๐—ป๐—ฑ๐—ถ๐—ป๐—ด ๐—ถ๐—ป ๐Ÿฎ๐Ÿฌ๐Ÿฎ๐Ÿฒ๐Ÿ˜

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โค2๐Ÿ‘1
Which library is used for basic plotting in Python?
Anonymous Quiz
7%
A) NumPy
10%
B) Pandas
79%
C) Matplotlib
3%
D) TensorFlow
โค1
Which function is used to display a plot?
Anonymous Quiz
8%
A) showplot()
4%
B) display()
22%
โค1
What type of chart is best for showing trends over time?
Anonymous Quiz
11%
A) Bar chart
8%
B) Pie chart
68%
C) Line chart
13%
D) Histogram
โค2
Which library is used for advanced and attractive visualizations?
Anonymous Quiz
21%
A) Matplotlib
67%
B) Seaborn
7%
C) NumPy
5%
D) SciPy
โค2