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Last data update: 2014.03.03

R: Calculate Growth Rate From a Vector of Stock or Investment...

gains.rate

R Documentation

Calculate Growth Rate From a Vector of Stock or Investment Gains

Description

The formula is simply: overall.rate = prod(gains + 1) - 1. If xday is specified, then it converts to x-day growth rate. For example, if balances is a vector of stock gains over a five-day period, say c(-0.02, -0.01, 0.01, 0.02, 0.01), then the total growth rate is approximately 0.0095 over five trading days. If xday.rate is set to 1, this rate is converted to an average daily rate of approximately 0.0019.

Usage

gains.rate(gains, xday.rate = NULL)

Arguments

`gains`	Numeric vector of stock or investment gains. Has to be daily gains if you want to calculate x-day rather than overall growth.
`xday.rate`	Number of days for growth rate calculation. If unspecified, function returns total growth. If set to 251, function would return annual growth rate.

Details

Value

Numeric value indicating the growth rate.

Note

Author(s)

Dane R. Van Domelen

References

Acknowledgment: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-0940903.

Examples

# Create vector of daily gains for a hypothetical stock
daily.gains <- c(-0.02, -0.01, 0.01, 0.02, 0.01)

# Overall growth is 0.95%
gains.rate(daily.gains)

# Average daily growth is 0.19%
gains.rate(daily.gains, 1)

# Corresponds to 60.7% annual growth
gains.rate(daily.gains, 251)