Choosing of X and Y axis in linearity plot

[amitavaghosh]

During linearity plot why we are taking concentration in Xaxis and response(area) in Yaxis. why not the opposite?

[zokitano]

Because x is always the independent quantity and y - the dependent quantity.
The response of the analyte (y quantity, e.g absorbance units) is always dependent on the amount (independent quantity) of the analyte (e.g its concentration).

Regards

[tom jupille]

For the same reason that maps are drawn with North at the top: doing it one consistent way makes things easier to interpret. In principle, the independent variable could just as well be shown on the vertical axis, but that would confuse people.

[AdrianF]

It is a convention but it is important to stick to it if you are calculating the regression mathematically.

The calculation of the line of regression assumes that the x values are known precisely and all the variation is in the y values. (eg peak area or height in HPLC)

[amitavaghosh]

thanks dear all