http://www.statsdirect.com/help/data_preparation/log_trans.htm
Effects of log transformation:
* Variance stabilisation.
* Increasing slopes in x in relation to another variable are linearized.
* Positively skewed distributions of x are normalized.
The function named Log (natural) calculates the natural (Naperian, log to the base e) logarithm of the data you select.
The function named Log (base 10) calculates the common (log to the base 10) logarithm of the data you select.
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