X = normalise(X)
X = normalise(X,NormDate,...)
x [ tseries ] - Input time series that will be normalised.
NormDate [ numeric | 'start' | 'end' | 'nanStart' | 'nanEnd' ] - Date relative to which the input data will be normalised; if not specified, 'nanStart' (the first date for which all columns have an observation) will be used.
X [ tseries ] - Normalised time series.'mode=' [ 'add' | 'mult' ] - Additive or multiplicative normalisation.