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✅ Interviewer: Show total revenue for the current year, updating automatically as time progresses.

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)

(Or use built-in TOTALYTD() if a date table is set up) 
3. Added a KPI or card visual to display the revenue 
4. Set up a date table & marked it as Date Table for accurate time intelligence 
5. Formatted currency and added data labels for clarity

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1) Practice data wrangling daily (Pandas, dplyr)
2) Work on small end-to-end projects (ETL, analysis, visualization)
3) Revisit and improve previous notebooks or scripts
4) Share findings in a clear, story-driven way
5) Follow data science blogs, newsletters, and researchers
6) Tackle weekly datasets or Kaggle competitions
7) Maintain a notebooks/journal with experiments and results
8) Version control your work (Git + GitHub)
9) Learn to communicate uncertainty (confidence intervals, p-values)
10) Stay curious about new tools (SQL, Python libs, ML basics)

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📊 Python for Data Science – Complete Beginner Roadmap 🐍🚀

🔹 What is Data Science?

Data Science is about: Collecting data Cleaning it Analyzing it Finding insights Making predictions

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- Detect fraud 💳

🧭 Step-by-Step Roadmap

🔹 1️⃣ Strengthen Python Basics

Focus on: Lists, dictionaries Loops & conditions Functions Basic file handling

👉 Because data is handled using these structures.

🔹 2️⃣ Learn NumPy (Numerical Computing)

NumPy is used for: Fast calculations Working with arrays

import numpy as np
arr = np.array([1,2,3])
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👉 Used in: Machine learning Scientific computing

🔹 3️⃣ Learn Pandas (Most Important 🔥)

Pandas helps you: Read data (CSV, Excel) Clean data Analyze data

import pandas as pd
df = pd.read_csv("data.csv")
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👉 Must learn: head(), info() filtering groupby() merge()

🔹 4️⃣ Data Visualization

Tools: matplotlib seaborn

import matplotlib.pyplot as plt
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plt.show()

👉 Used to: Present insights Create reports Build dashboards

🔹 5️⃣ Statistics Basics (Very Important)

Learn: Mean, Median, Mode Standard Deviation Probability basics

👉 Data science = math + logic + code

🔹 6️⃣ Data Cleaning (Real-World Skill)

Real data is messy 😅

You should learn:
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- Removing duplicates
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df.dropna()
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✅ Data Cleaning in Pandas 🐍🧹

👉 In real projects, 80% of the work = Data Cleaning

Because raw data is always messy 😅

🔹 1. Why Data Cleaning?

Real-world data may have:
❌ Missing values
❌ Duplicate records
❌ Wrong formats
❌ Extra spaces

👉 Cleaning makes data usable for analysis & ML.

🔥 2. Handling Missing Values

✅ Check Missing Values

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

✅ Remove Missing Values
df.dropna()

✅ Fill Missing Values
df.fillna(0)

👉 Replace missing values with 0 or mean.

🔹 3. Remove Duplicates

df.drop_duplicates()

🔹 4. Rename Columns

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

🔹 5. Change Data Types

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

🔹 6. Remove Extra Spaces

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

🔹 7. Replace Values

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

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