A dot plot is judged by its position along an axis; in this case, the horizontal or x axis. A bar chart is judged by the length of the bar. I don’t like using lengths with logarithmic scales.

Logarithmic price scale—also referred to as log—represents price spacing on the vertical or Y-axis dependent on the percentage of change in the underlying asset's price.

The PROC PLOT step shows two plots of the same data -- one plot without a horizontal axis specification and one plot with a logarithmic scale specified for the horizontal axis. Program: options nodate ...