# Log base 10 function

To use this function, choose Calc > Calculator.

Calculates the exponent to which 10 must be raised to equal a given number. For example, 102 = 100, so the log base 10 of 100 is 2. Log base 10 is defined only for positive numbers. When you multiply a number by 10, you increase its log by 1; when you divide a number by 10, you decrease its log by 1.

## Syntax

LOGTEN(number)

In number, specify the value or column of values. Minitab computes the value x such that 10x = the number. If you enter 0 or a negative number, Minitab stores a missing value *.

## Example

Calculator expression Result
LOGTEN(0.01) -2
LOGTEN(0.1) -1
LOGTEN(1) 0
LOGTEN(10) 1
LOGTEN(100) 2

## Uses

In statistics, log base 10 (log10) can be used to transform data for the following reasons:
• To make positively skewed data more "normal"
• To account for curvature in a linear model
• To stabilize variation within groups
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