Senior Data Analyst Interview Questions and Answers for Freshers

R square is a statistical measure that represents the proportion of the variance for a dependent variable that's explained by an independent variable.

• R square is also known as the coefficient of determination.

• It ranges from 0 to 1, with 1 indicating a perfect fit.

• It is used to evaluate the goodness of fit of a regression model.

• Higher R square values indicate that the model explains a larger proportion of the variance in the dependent variable.

• For example, an R square of 0.8 m...read more

Model fit can be checked using various statistical measures and techniques.

• Check goodness of fit statistics like R-squared, AIC, BIC

• Analyze residuals to ensure they are normally distributed and homoscedastic

• Use diagnostic plots like QQ plots, residual plots, and leverage plots

• Perform cross-validation to assess model performance on unseen data

Salary decisions are based on market research and internal equity, while work culture is collaborative and supportive.

• Salary decisions are typically made based on market research to ensure competitiveness and internal equity to maintain fairness within the organization.

• Work culture is described as collaborative, where team members support each other and work together towards common goals.

• Open communication and transparency are valued in the work culture, allowing for feedback...read more

A Transformer is a type of deep learning model that uses attention mechanisms to improve the efficiency of sequence-to-sequence tasks.

• Utilizes self-attention mechanism to weigh the importance of different input elements

• Commonly used in natural language processing tasks such as machine translation and text generation

• Examples include BERT, GPT, and Transformer-XL

Order of execution for SQL queries

• 1. FROM - Specifies the tables involved in the query

• 2. WHERE - Filters the rows based on specified conditions

• 3. GROUP BY - Groups the rows based on specified columns

• 4. HAVING - Filters the groups based on specified conditions

• 5. SELECT - Retrieves the columns to be displayed

• 6. ORDER BY - Sorts the result set based on specified columns