Scale Type
Two types of chart Scaling can be selected: Linear or Semi-Log.
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Semi-Log Scaling
A Semi-Log (percent-of-change) price scale is a percentage-based scale. A 10% change in price will always be represented by the same displacement along the vertical axis, regardless of the absolute price change. A $5 price change from a $50 base price (10%) will be represented by the exact same vertical displacement as a $10 price change from a $100 base price (10%), even though the absolute values of $5 and $10 are not equal.
Setting Semi-Log Scaling Type
Scaling Type is set from the Format Symbol window:
- Open the Format Symbol window.
To open the Format Instruments window, click the Format Instruments icon on the main toolbar;
if the Format Objects window appears, select the symbol and click the Format button.
The Format Instruments window can also be opened by one of the following methods:
- Position the mouse pointer over the symbol's data series; double-click once the Pointer changes into a Hand ;
- Position the mouse pointer over the symbol's data series; once the Pointer changes into a Hand right-click and then click Format Symbol Name;
- Right-click on an empty area of the chart and then click Format Instruments; if the Format Objects window appears, select the symbol and click the Format button;
- Select Format in the main menu and click Instrument; if the Format Objects window appears, select the symbol and click the Format button. - Select the Scaling tab.
- In the Scaling Type section, click the Semi-Log radio button.
To center the last quote in the middle of the price scale, check the Center Last Price check box; the last quote can not be centered for a chart with a User Defined price scale.
To use these scaling settings for all new charts, check Use as Default check box.