LOG Instruction

LOG series start end newseries newstart

Takes the natural log of a series. This can also be done easily using SET.

Wizard

You can use the Data/Graphics>Transformations wizard to take logs.

Parameters

series	source series
start, end	range to transform, by default range of series
newseries	result series, by default, same as series
newstart	start for newseries, by default start

Examples

The first instruction takes the natural log of GNP and puts it into the series LOGGNP. The second replaces the series FORECAST by its log.

log gnp / loggnp

log forecast

Here is how you would do these same operations using SET:

set loggnp = log(gnp)

set forecast = log(forecast)

You can use a DOFOR loop to take logs of multiple series. Here, we use the %S and %L functions to save the logs into new series by appending the prefix LOG to the existing series names, producing LOGUSGDP, LOGJPNGDP, LOGCANGDP, and LOGGBRGDP.

dofor ser = usgdp jpngdp cangdp gbrgdp

log ser / %s("log"+%l(ser))

end