Grocer Function

NAME

growthr - growth rate of a ts

CALLING SEQUENCE

ts=growthr(ts,lag)

PARAMETERS

Input

Output

DESCRIPTION

Computes ts(t)/ts(t-lag)-1. If a value for ts is 0, then the corresponding value is set to 'NA'.

EXAMPLE

1) gx = growthr(x)
2) ga = growthr(x,12)

gx is simply the growth rate of ts x; if ts is a monthly ts, ga is mom annual growth rate.

AUTHOR

Eric Dubois 2002