[saosebastiao]

I agree, but it is rarely the fault of the person presenting them. Unfortunately most "easy to use" graphing technologies (with Excel being the worst offender) take the most deceptive graphing techniques and make them defaults.

[brandonbloom]

> most deceptive graphing techniques

They are deceptive because they exaggerate features of the data in order to improve perception of configuration changes. If every graph started at zero, many datasets would look like flat lines... not a great user experience when graphing.

[TwoBit]

Of course it's the fault of the person presenting them. If they are competent enough to understand what they are presenting, they are competent enough to adjust a y axis baseline.