D. Davis
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Number the Vertical Axis and Add Constant Compound Percent Growth Lines to the SSG Plus
Number the vertical log axis and include constant compound growth lines on the visual analysis chart beginning at the origin of the chart and running across the chart.
• The vertical (log) axis appears to be auto ranging. While that’s understandable, the decision to make it auto ranging carries with it the disadvantages of disguising what the growth rates of companies are. Two companies that look similar on the charts may be growing at significantly different rates.
• Numbers on the log axis, would enable one to estimate the average percent growth rate plotted on the chart and compare it to that of other companies being studied without clicking numerous years away to then read numeric calculations.
• The divisions of the vertical log are made with horizontal lines spaced unevenly up the axis. There are about 12 of these lines per log cycle. That adds to the difficulty of using the divisions without numbers along the axis. I was able to determine the spacing is log base 10 by finding data points one log cycle apart on the chart and then observing the numbers were different by about ten times. But the “extra divisions” on the chart make it difficult to know exactly what is plotted.
• Constant growth rate lines assist in estimating both the growth rate and the variation of growth rate by visual inspection. This is especially important when auto ranging charts are used.
• I have noted the Core SSG vertical log axis is numbered. I regularly use the SSG Plus, but haven’t used the Core SSG since the SSG Plus was first introduced.