Check the Scale First

Start with three category values: A has 6 items, B has 10 items, and C has 8 items. Before comparing bars, check that the y-axis starts at 0 and the tick labels step by 5. On that checked scale, B is 4 higher than A. That is a simple readout from this chart, not a broader claim.

A tiny scale readout: check the y-axis baseline and tick labels before comparing bars.

highlighted = computed this step

Start with values

Start with 3 pinned category values.

pinned values\text{pinned values}
Pinned Category ValuescategoryitemsA6B10C8

Read the scale first

Check the y-axis baseline and tick labels before comparing bars.

baseline and ticks first\text{baseline and ticks first}
Scale Check Before Readingcheckwhat to seebaseline0tick labels0, 5, 10, 15unititems

Compare on the checked scale

Use the checked scale: the y-axis starts at 0 and ticks step by 5.

zero-baseline scale\text{zero-baseline scale}
Items by Category (baseline starts at 0)categoryitems0510156A10B8C

State the simple readout

Readout: B is 4 higher than A on this checked scale.

compare after scale check\text{compare after scale check}
Scale-Checked Readoutreadoutvaluehighest barB = 10compareB is 4 higher than Ascale checkedstarts at 0