This document discusses residual mapping, which is used to analyze the relationship between two areal variables. It provides steps for calculating residual values, which indicate the difference between observed and estimated dependent variable (y) values. Positive residual values mean y is higher than estimated, while negative values mean y is lower. The document includes a calculation and data table applying this process to analyze the relationship between area and population in West Bengal districts. The resulting residual map shows major parts of several districts have well-distributed populations relative to their areas, while northern districts generally have negative residuals.