Calculates the estimated error/standard deviation of the conditional mean forecast.

## Syntax

**AIRLINE_FORESD**(

**X**,

**Order**,

**mean**,

**sigma**,

**s**,

**theta**,

**theta2**,

**T**)

- X
- is the univariate time series data (one dimensional array of cells (e.g. rows or columns)).
- Order
- is the time order in the data series (i.e. the first data point's corresponding date (earliest date=1 (default), latest date=0)).
Order Description 1 ascending (the first data point corresponds to the earliest date) (default) 0 descending (the first data point corresponds to the latest date) - mean
- is the model mean (i.e. mu).
- sigma
- is the standard deviation of the model's residuals/innovations.
- s
- is the length of seasonality (expressed in terms of lags, where s > 1).
- theta
- is the coefficient of first-lagged innovation (see model description).
- theta2
- is the coefficient of s-lagged innovation (see model description).
- T
- is the forecast time/horizon (expressed in terms of steps beyond end of the time series).

####
* *Warning

AIRLINE_FORESD() function is deprecated as of version 1.63: use AIRLINE_FORE function instead.

## Remarks

- The underlying model is described here.
- The time series is homogeneous or equally spaced.
- The time series may include missing values (e.g. #N/A) at either end.

## Files Examples

## Related Links

## References

- Hamilton, J .D.; Time Series Analysis , Princeton University Press (1994), ISBN 0-691-04289-6
- Tsay, Ruey S.; Analysis of Financial Time Series John Wiley & SONS. (2005), ISBN 0-471-690740

## Comments

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