Lead Data Analyst Interview Questions and Answers

loc and iloc are two methods in pandas used for selecting data from a DataFrame based on labels or integer index.

• loc is label-based, meaning you specify the row and column labels to select data

• iloc is integer index-based, meaning you specify the row and column indices to select data

• Example: df.loc['row_label', 'column_label'] vs df.iloc[row_index, column_index]

Data relevant for derivative transactions include underlying asset, contract terms, market price, expiration date, and counterparty information.

• Underlying asset (e.g. stock, commodity, currency)

• Contract terms (e.g. type of derivative, quantity, strike price)

• Market price of the underlying asset

• Expiration date of the contract

• Counterparty information (e.g. name, creditworthiness)

Data analysis involves cleaning, transforming, and interpreting data to extract meaningful insights.

• Data is collected from various sources such as databases, surveys, or sensors

• The data is cleaned to remove errors, duplicates, and inconsistencies

• Data is transformed and structured for analysis using tools like Excel, Python, or R

• Statistical techniques and machine learning algorithms are applied to identify patterns and trends

• Visualizations such as charts or graphs are created ...read more