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Data Analytics with python.

Starting date:- 10th oct 2024
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Here are 25 most common Deep Learning interview questions for ML research positions:

Fundamentals:
- What is deep learning, and how does it differ from traditional machine learning?
- What is an activation function, and why is it important? Explain three types of activation functions.
- You are using a deep neural network for prediction, but it overfits the training data. What can you do to reduce overfitting?
- What is the vanishing gradient problem in neural networks, and how can it be fixed?
- Explain the process of backpropagation.

Neural Network Architectures:
- Describe the architecture of a typical Convolutional Neural Network (CNN).
- What are Autoencoders, and what are three practical uses of them?
- What is a transformer architecture, and how is it used in NLP tasks?
- What is the role of pooling layers in CNNs?
- What are Recurrent Neural Networks (RNNs), and where are they used?

Training and Optimization:
- How does L1/L2 regularization affect a neural network?
- Why should we use Batch Normalization?
- How do you know if your model is suffering from exploding gradients?
- What is the purpose of dropout in neural networks, and how does it affect training?
- What are some hyperparameters used in training neural networks?

Advanced Topics:
- What are the main gates in LSTM networks, and what are their tasks?
- Explain how self-attention works in transformers.
- Can CNNs be used to classify 1D signals?
- What is transfer learning, and when is it recommended or not?
- How do depthwise separable convolutions improve CNNs?

Practical Implementation:
- Describe the process of pre-training and fine-tuning in transformers.
- What are the main challenges when training a deep learning model with limited data?
- How do you handle class imbalance in deep learning?
- What are the challenges of deploying deep learning models in production?
- How would you modify a pre-trained model from classification to regression?

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Top 10 important data science concepts

1. Data Cleaning: Data cleaning is the process of identifying and correcting or removing errors, inconsistencies, and inaccuracies in a dataset. It is a crucial step in the data science pipeline as it ensures the quality and reliability of the data.

2. Exploratory Data Analysis (EDA): EDA is the process of analyzing and visualizing data to gain insights and understand the underlying patterns and relationships. It involves techniques such as summary statistics, data visualization, and correlation analysis.

3. Feature Engineering: Feature engineering is the process of creating new features or transforming existing features in a dataset to improve the performance of machine learning models. It involves techniques such as encoding categorical variables, scaling numerical variables, and creating interaction terms.

4. Machine Learning Algorithms: Machine learning algorithms are mathematical models that learn patterns and relationships from data to make predictions or decisions. Some important machine learning algorithms include linear regression, logistic regression, decision trees, random forests, support vector machines, and neural networks.

5. Model Evaluation and Validation: Model evaluation and validation involve assessing the performance of machine learning models on unseen data. It includes techniques such as cross-validation, confusion matrix, precision, recall, F1 score, and ROC curve analysis.

6. Feature Selection: Feature selection is the process of selecting the most relevant features from a dataset to improve model performance and reduce overfitting. It involves techniques such as correlation analysis, backward elimination, forward selection, and regularization methods.

7. Dimensionality Reduction: Dimensionality reduction techniques are used to reduce the number of features in a dataset while preserving the most important information. Principal Component Analysis (PCA) and t-SNE (t-Distributed Stochastic Neighbor Embedding) are common dimensionality reduction techniques.

8. Model Optimization: Model optimization involves fine-tuning the parameters and hyperparameters of machine learning models to achieve the best performance. Techniques such as grid search, random search, and Bayesian optimization are used for model optimization.

9. Data Visualization: Data visualization is the graphical representation of data to communicate insights and patterns effectively. It involves using charts, graphs, and plots to present data in a visually appealing and understandable manner.

10. Big Data Analytics: Big data analytics refers to the process of analyzing large and complex datasets that cannot be processed using traditional data processing techniques. It involves technologies such as Hadoop, Spark, and distributed computing to extract insights from massive amounts of data.


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Data science interview questions ๐Ÿ‘‡

๐—ฆ๐—ค๐—Ÿ
- How do you write a query to fetch the top 5 highest salaries in each department?
- Whatโ€™s the difference between the HAVING and WHERE clauses in SQL?
- How do you handle NULL values in SQL, and how do they affect aggregate functions?

๐—ฃ๐˜†๐˜๐—ต๐—ผ๐—ป
- How do you handle large datasets in Python, and which libraries would you use for performance?
- What are context managers in Python, and how do they help with resource management?
- How do you manage and log errors in Python-based ETL pipelines?

๐— ๐—ฎ๐—ฐ๐—ต๐—ถ๐—ป๐—ฒ ๐—Ÿ๐—ฒ๐—ฎ๐—ฟ๐—ป๐—ถ๐—ป๐—ด
- Explain the difference between bias and variance in a machine learning model. How do you balance them?
- What is cross-validation, and how does it improve the performance of machine learning models?
- How do you deal with class imbalance in classification tasks, and what techniques would you apply?

๐——๐—ฒ๐—ฒ๐—ฝ ๐—Ÿ๐—ฒ๐—ฎ๐—ฟ๐—ป๐—ถ๐—ป๐—ด
- What is the vanishing gradient problem in deep learning, and how can it be mitigated?
- Explain how a convolutional neural network (CNN) works and when you would use it.
- What is dropout in neural networks, and how does it help prevent overfitting?

๐——๐—ฎ๐˜๐—ฎ ๐—ช๐—ฟ๐—ฎ๐—ป๐—ด๐—น๐—ถ๐—ป๐—ด
- How would you handle outliers in a dataset, and when is it appropriate to remove or keep them?
- Explain how to merge two datasets in Python, and how would you handle duplicate or missing entries in the merged data?
- What is data normalization, and when should you apply it to your dataset?

๐——๐—ฎ๐˜๐—ฎ ๐—ฉ๐—ถ๐˜€๐˜‚๐—ฎ๐—น๐—ถ๐˜‡๐—ฎ๐˜๐—ถ๐—ผ๐—ป - ๐—ง๐—ฎ๐—ฏ๐—น๐—ฒ๐—ฎ๐˜‚
- How do you create a dual-axis chart in Tableau, and when would you use it?
- How would you filter data in Tableau to create a dynamic dashboard that updates based on user input?
- What are calculated fields in Tableau, and how would you use them to create a custom metric?

#datascience #interview
Genpact is hiring!
Position: Business Analyst/ Data Analyst!
Qualification: Bachelorโ€™s/ Masterโ€™s Degree
Salary: 5.9 - 8.6 LPA (Expected)
Experienc๏ปฟe: Freshers/ Experienced
Location: Bangalore/ Hyderabad/ Gurugram

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How to Become a Data Analyst from Scratch! ๐Ÿš€

Whether you're starting fresh or upskilling, here's your roadmap:

โžœ Master Excel and SQL - solve SQL problems from leetcode & hackerank
โžœ Get the hang of either Power BI or Tableau - do some hands-on projects
โžœ learn what the heck ATS is and how to get around it
โžœ learn to be ready for any interview question
โžœ Build projects for a data portfolio
โžœ And you don't need to do it all at once!
โžœ Fail and learn to pick yourself up whenever required

Whether it's acing interviews or building an impressive portfolio, give yourself the space to learn, fail, and grow. Good things take time โœ…

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I have curated best top-notch Data Analytics Resources ๐Ÿ‘‡๐Ÿ‘‡
https://topmate.io/codingdidi

Hope it helps :)
Resume key words for data scientist role explained in points:

1. Data Analysis:
- Proficient in extracting, cleaning, and analyzing data to derive insights.
- Skilled in using statistical methods and machine learning algorithms for data analysis.
- Experience with tools such as Python, R, or SQL for data manipulation and analysis.

2. Machine Learning:
- Strong understanding of machine learning techniques such as regression, classification, clustering, and neural networks.
- Experience in model development, evaluation, and deployment.
- Familiarity with libraries like TensorFlow, scikit-learn, or PyTorch for implementing machine learning models.

3. Data Visualization:
- Ability to present complex data in a clear and understandable manner through visualizations.
- Proficiency in tools like Matplotlib, Seaborn, or Tableau for creating insightful graphs and charts.
- Understanding of best practices in data visualization for effective communication of findings.

4. Big Data:
- Experience working with large datasets using technologies like Hadoop, Spark, or Apache Flink.
- Knowledge of distributed computing principles and tools for processing and analyzing big data.
- Ability to optimize algorithms and processes for scalability and performance.

5. Problem-Solving:
- Strong analytical and problem-solving skills to tackle complex data-related challenges.
- Ability to formulate hypotheses, design experiments, and iterate on solutions.
- Aptitude for identifying opportunities for leveraging data to drive business outcomes and decision-making.


Resume key words for a data analyst role

1. SQL (Structured Query Language):
- SQL is a programming language used for managing and querying relational databases.
- Data analysts often use SQL to extract, manipulate, and analyze data stored in databases, making it a fundamental skill for the role.

2. Python/R:
- Python and R are popular programming languages used for data analysis and statistical computing.
- Proficiency in Python or R allows data analysts to perform various tasks such as data cleaning, modeling, visualization, and machine learning.

3. Data Visualization:
- Data visualization involves presenting data in graphical or visual formats to communicate insights effectively.
- Data analysts use tools like Tableau, Power BI, or Python libraries like Matplotlib and Seaborn to create visualizations that help stakeholders understand complex data patterns and trends.

4. Statistical Analysis:
- Statistical analysis involves applying statistical methods to analyze and interpret data.
- Data analysts use statistical techniques to uncover relationships, trends, and patterns in data, providing valuable insights for decision-making.

5. Data-driven Decision Making:
- Data-driven decision making is the process of making decisions based on data analysis and evidence rather than intuition or gut feelings.
- Data analysts play a crucial role in helping organizations make informed decisions by analyzing data and providing actionable insights that drive business strategies and operations.

Data Science Interview Resources
๐Ÿ‘‡๐Ÿ‘‡
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Citi is hiring Analyst
Experienc๏ปฟe: Freshers
https://jobs.citi.com/job/-/-/287/68234635200


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โœ…๐Ÿ“-๐’๐ญ๐ž๐ฉ ๐‘๐จ๐š๐๐ฆ๐š๐ฉ ๐ญ๐จ ๐’๐ฐ๐ข๐ญ๐œ๐ก ๐ข๐ง๐ญ๐จ ๐ญ๐ก๐ž ๐ƒ๐š๐ญ๐š ๐€๐ง๐š๐ฅ๐ฒ๐ญ๐ข๐œ๐ฌ ๐…๐ข๐ž๐ฅ๐โœ…

๐Ÿ’โ€โ™€๏ธ๐๐ฎ๐ข๐ฅ๐ ๐Š๐ž๐ฒ ๐’๐ค๐ข๐ฅ๐ฅ๐ฌ: Focus on core skillsโ€”Excel, SQL, Power BI, and Python.

๐Ÿ’โ€โ™€๏ธ๐‡๐š๐ง๐๐ฌ-๐Ž๐ง ๐๐ซ๐จ๐ฃ๐ž๐œ๐ญ๐ฌ: Apply your skills to real-world data sets. Projects like sales analysis or customer segmentation show your practical experience. You can find projects on Youtube.

๐Ÿ’โ€โ™€๏ธ๐…๐ข๐ง๐ ๐š ๐Œ๐ž๐ง๐ญ๐จ๐ซ: Connect with someone experienced in data analytics for guidance(like me ๐Ÿ˜…). They can provide valuable insights, feedback, and keep you on track.

๐Ÿ’โ€โ™€๏ธ๐‚๐ซ๐ž๐š๐ญ๐ž ๐๐จ๐ซ๐ญ๐Ÿ๐จ๐ฅ๐ข๐จ: Compile your projects in a portfolio or on GitHub. A solid portfolio catches a recruiterโ€™s eye.

๐Ÿ’โ€โ™€๏ธ๐๐ซ๐š๐œ๐ญ๐ข๐œ๐ž ๐Ÿ๐จ๐ซ ๐ˆ๐ง๐ญ๐ž๐ซ๐ฏ๐ข๐ž๐ฐ๐ฌ: Practice SQL queries and Python coding challenges on Hackerrank & LeetCode. Strengthening your problem-solving skills will prepare you for interviews.
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NEW VIDEO UPLOADED

I hope it helps!!


https://youtu.be/-rY4i2lAOq0?si=GoDQMlV2f-MYslxq
@Codingdidi pinned ยซNEW VIDEO UPLOADED I hope it helps!! https://youtu.be/-rY4i2lAOq0?si=GoDQMlV2f-MYslxqยป
20 Must-Know Statistics Questions for Data Analyst and Business Analyst Role:



1๏ธโƒฃ What is the difference between descriptive and inferential statistics?
2๏ธโƒฃ Explain mean, median, and mode and when to use each.
3๏ธโƒฃ What is standard deviation, and why is it important?
4๏ธโƒฃ Define correlation vs. causation with examples.
5๏ธโƒฃ What is a p-value, and how do you interpret it?
6๏ธโƒฃ Explain the concept of confidence intervals.
7๏ธโƒฃ What are outliers, and how can you handle them?
8๏ธโƒฃ When would you use a t-test vs. a z-test?
9๏ธโƒฃ What is the Central Limit Theorem (CLT), and why is it important?
๐Ÿ”Ÿ Explain the difference between population and sample.
1๏ธโƒฃ1๏ธโƒฃ What is regression analysis, and what are its key assumptions?
1๏ธโƒฃ2๏ธโƒฃ How do you calculate probability, and why does it matter in analytics?
1๏ธโƒฃ3๏ธโƒฃ Explain the concept of Bayesโ€™ Theorem with a practical example.
1๏ธโƒฃ4๏ธโƒฃ What is an ANOVA test, and when should it be used?
1๏ธโƒฃ5๏ธโƒฃ Define skewness and kurtosis in a dataset.
1๏ธโƒฃ6๏ธโƒฃ What is the difference between parametric and non-parametric tests?
1๏ธโƒฃ7๏ธโƒฃ What are Type I and Type II errors in hypothesis testing?
1๏ธโƒฃ8๏ธโƒฃ How do you handle missing data in a dataset?
1๏ธโƒฃ9๏ธโƒฃ What is A/B testing, and how do you analyze the results?
2๏ธโƒฃ0๏ธโƒฃ What is a Chi-square test, and when is it used?
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hurry up.

It's just for the first 100 participants.
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