harmonic.mean {psych} | R Documentation

## Find the harmonic mean of a vector, matrix, or columns of a data.frame

### Description

The harmonic mean is merely the reciprocal of the arithmetic mean of the reciprocals.

### Usage

    harmonic.mean(x,na.rm=TRUE,zero=TRUE)

### Arguments

`x` | a vector, matrix, or data.frame
`na.rm` | na.rm=TRUE remove NA values before processing
`zero` | If TRUE, then if there are any zeros, return 0, else, return the harmonic mean of the non-zero elements

### Details

Included as an example for teaching about functions. As well as for a discussion of how to estimate central tendencies. Also used in `statsBy` to weight by the harmonic mean.

Values of 0 can be included (in which case the harmonic.mean = 0) or converted to NA according to the zero option.

Added the zero option, March, 2017.

### Value

The harmonic mean(s)

### Note

Included as a simple demonstration of how to write a function

### Examples

    x <- seq(1,5)
    x2 <- x^2
    x2[2] <- NA
    y <- x - 1
    X <- data.frame(x,x2,y)
    harmonic.mean(x)
    harmonic.mean(x2)
    harmonic.mean(X)
    harmonic.mean(X,na.rm=FALSE)
    harmonic.mean(X,zero=FALSE)

[Package psych version 1.7.5 Index]