Select a transformation from the list provided.
| None |
xt = x |
| Log10 |
xt = log10x
The data is transformed, and the X axis remains at a constant scale.
|
| Log10 (scale) |
The data is not transformed. The X axis is displayed using a Log10 scale. Use this option as well as the menu command Display > Probability curve to create a Log-Probability graph for data which contains all positive values. |
| Log10 (with constant) |
xt = log10(x+c)
The data (plus the specified constant value) is transformed, and the X axis remains at a constant scale.
|
| Log10 (with constant) (scale) |
The specified constant is added to the data. The X axis is displayed using a Log10 scale. Use this option as well as the menu command Display > Probability curve to create a Log-Probability graph for data which contains values of zero or negative values.
Note: Ensure that the constant is large enough to transform all data values to a value greater than zero. For example, if the smallest data value is -1, use a scale of 1.001 or larger.
|
| Natural Log |
xt = ln x |
| Natural Log (with constant) |
xt = ln (x+c) |
| Natural Exponential |
xt = ex |
| Power |
xt = xc |
| Box & Cox |
xt = (xc - 1)/c |
| Standardisation |
xt = (x - xmean) / (std dev) |
| Scale Up |
xt = x * c |
| Scale Down |
xt = x / c |
Provide a constant to be used where c is specified in the above transformations.
Transform form.