# Compare relationships independent of units

I am trying to compare multiple columns of data with different units graphically. If I z-score the whole dataset am I introducing any error? Can I safely compare from column to column?

Eg

Pb(mg) CO(kg) N(?)
42.         6543.   123
49.         7989.    456
54.          4577.   222

• By comparing relationships are you implying correlation between two variables? – Arun Jose Nov 4 '16 at 11:15
• No, I simply want to know how I can compare mg of lead (Pb) to kg of carbon monoxide (CO) on the same Y axis. Will Z-scoring keep me from having to convert the units? – Rilcon42 Nov 4 '16 at 14:22