Height to weight is an: (DNB Jan 2010)
Ref: High Yield Biostatistics, Pg: 47
Correlation & Regression
Correlation : It describes the relationship between two numerical variables on a scatter plot.
Association:Simultaneous existence of two variables
Proportion:Relationship of a part to the whole, where numerator is always a part of the denominator
Index:Takes into account two or more indicators for its calculation