Deep Learning - Crash Course 2023 - Cleaning and Examining the data

The video tutorial covers handling missing values in pandas dataframes, including detection, dropping, and imputation techniques. It explains querying and slicing dataframes, using conditional operators for data selection, and applying functions efficiently with the apply method. The tutorial also discusses data examination using describe and value_counts methods.

What are the two primary methods to handle missing values in a DataFrame?

• Convert data types and rename columns

• Remove rows/columns with nulls and use imputation

• Remove duplicates and sort values

• Merge and join DataFrames

Which method is used to identify missing values in a DataFrame?

• dropna

• fillna

• notnull

• isnull

How can you remove rows with null values from a DataFrame?

• Using the fillna method

• Using the dropna method

• Using the replace method

• Using the append method

What is the result of using the iloc attribute on a DataFrame?

• It returns data based on column labels

• It returns data based on index positions

• It returns data based on a condition

• It returns data based on column data types

Which attribute would you use to access data by index label?

• at

• iloc

• iat

• loc

What is the purpose of using conditional operators on a DataFrame?

• To change data types

• To filter data based on specific criteria

• To sort the DataFrame

• To merge two DataFrames

When is imputation particularly useful?

• When data types need conversion

• When there are no missing values

• When there is a large amount of missing data

• When columns need renaming

What does the describe method provide for a DataFrame?

• A plot of the data distribution

• A list of all column names

• A count of all missing values

• A summary of the dataset including mean and standard deviation

How can you count the occurrences of each category in a categorical column?

• Using the groupby method

• Using the value_counts method

• Using the pivot_table method

• Using the merge method

What is the advantage of using the apply method on a DataFrame?

• It allows for vectorized operations

• It is slower than iterating manually

• It changes the data type of columns

• It merges two DataFrames