# Dimension Analysis

Dimension Analysis ("DA") is one of the qualitative analysis.

It is useful to understand qualitative aspect of formulation. And it is also useful to check calculation. You may find problems in the "theory" easily with DA, even if the "theory" is difficult and complicated.

The "dimension" here is a unit. You may learn Data Science promptly, when you use DA.

## Quantative Analysis with Dimension Analysis

It is DA when you check the items below.

• Both side of the formulation : Check unit of both side and understand what is suggested
• Addition, Subtraction, Multiplication and Division : Check Addition, Subtraction, Multiplication and Division and understand what is calculated
• Look for quantity with zero dimension : Zero dimension is useful

## Check Formulation with Dimension Analysis

• Both side of formulation : The unit of left side and right side is same
• Addition and Subtraction : Addition and Subtraction between different unit is forbidden
• Compare numbers : You cannot compare the numbers between different units
• Division : Division between same units makes zero dimension
• Check dimension when you change formulation and define quantity.

## Profit of Dimension Analysis

Differential calculus and integral calculus are often used in data science. With consciousness of dimension, you may learn differential calculus and integral calculus easily.

NEXT   Addition Model and Division Model 