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Data Cleaning and Analysis of Application Data

Introduction

This project involves the cleaning and analysis of a dataset called application_data.csv, which contains information on loan applications. The goal is to clean the data by handling missing values, removing unwanted columns, and exploring various features through visualizations.

Importing Libraries

Necessary libraries like numpy, pandas, matplotlib, seaborn, and warnings are imported to handle data manipulation, visualization, and suppressing warnings.

Data Loading

The application data is read into a DataFrame using pd.read_csv("application_data.csv").

Initial Data Exploration

  • Shape: The initial number of rows and columns is checked using df.shape.
  • Info: Detailed information about the DataFrame is obtained using df.info('all').
  • Null Values: The percentage of missing values in each column is calculated.

Handling Missing Values

  • Dropping Columns with >40% Missing Values: Columns with more than 40% missing values are dropped.
  • Null Values Verification: The percentage of missing values is checked again after dropping columns.

Column-Specific Missing Values Treatment

  • AMT_ANNUITY: Missing values are filled with the median value.
  • Rows with >40% Missing Values: Rows having more than 40% missing values are dropped.
  • Unwanted Columns: Several columns deemed unnecessary are dropped from the dataset.

Handling 'XNA' Values

  • CODE_GENDER: Rows with 'XNA' values are updated to 'F' based on the majority value.
  • ORGANIZATION_TYPE: Rows with 'XNA' values are dropped.

Data Type Conversion

Numeric columns are converted to the appropriate data types using pd.to_numeric.

Binning Income and Credit Amounts

  • AMT_INCOME_TOTAL: Binned into various ranges for better analysis.
  • AMT_CREDIT: Binned into various ranges for better analysis.

Dataset Splitting

The dataset is split into two based on the TARGET column:

  • target0_df: Clients without payment difficulties.
  • target1_df: Clients with payment difficulties.

Imbalance Calculation

The imbalance ratio between the majority (target0_df) and minority (target1_df) classes is calculated.

Visualization

Several visualizations are created to understand the distribution of various features:

  • Income Range Distribution: Plotted by CODE_GENDER.
  • Income Type Distribution: Plotted by CODE_GENDER.
  • Contract Type Distribution: Plotted by CODE_GENDER.
  • Organization Type Distribution: Plotted on a logarithmic scale.

Correlation Analysis

Correlation matrices are computed for both target classes and visualized using heatmaps.

Outlier Detection

Box plots are used to detect outliers in various features:

  • Income Amount: Distribution visualized for target0_df.
  • Credit Amount: Distribution visualized for both target0_df and target1_df.
  • Annuity Amount: Distribution visualized for both target0_df and target1_df.

Additional Visualizations

  • Credit Amount vs Education Status: Visualized using box plots.
  • Income Amount vs Education Status: Visualized using box plots.

Previous Application Data

  • Data Loading: Previous application data is read into df1.
  • Missing Data Handling: Columns with more than 40% missing values are dropped.
  • 'XNA' and 'XAP' Values: Rows with these values are removed.
  • Data Merging: The cleaned previous application data is merged with the application data.
  • Column Renaming: Columns are renamed for better understanding.

Visualization of Merged Data

  • Contract Status Distribution: Visualized with purposes.
  • Purposes Distribution by Target: Visualized with a count plot.
  • Credit Amount vs Loan Purpose: Visualized using box plots.
  • Credit Amount vs Housing Type: Visualized using bar plots.

Conclusion

The data cleaning and analysis process involves handling missing values, updating specific columns, binning continuous variables, splitting the dataset, visualizing distributions, and merging with previous application data. This comprehensive approach ensures a clean dataset for further analysis and modeling.