crost.ma | R Documentation |
Moving average with Croston's method decomposition for intermittent demand series with fixed or optimised parameters.
crost.ma(data,h=10,w=NULL,nop=c(2,1),type=c("croston","sba","sbj"), cost=c("mar","msr","mae","mse"),outplot=c(FALSE,TRUE), na.rm=c(FALSE,TRUE))
data |
Intermittent demand time series. |
h |
Forecast horizon. |
w |
Moving average order. If w == NULL then moving average orders are optimised. If w is a single value then the same order is used for smoothing both the demand and the intervals. If two values are provided then the second is used to smooth the intervals. |
nop |
Specifies the number of model parameters. Used only if they are optimised. 1. 1 - Demand and interval moving average order are the same; 2. 2 - Different demand and interval orders. |
type |
Croston's method variant: 1. "croston" Croston's method; 2. "sba" Syntetos-Boylan approximation; 3. "sbj" Shale-Boylan-Johnston. |
cost |
Cost function used for optimisation: 1. "mar" - Mean Absolute Rate; 2. "msr" - Mean Squared Rate; 3. "mae" - Mean Absolute Error; 4. "mse" - Mean Squared Error. |
outplot |
If TRUE a plot of the forecast is provided. |
na.rm |
A logical value indicating whether NA values should be remove using the method. |
model |
Type of model fitted. |
frc.in |
In-sample demand rate. |
frc.out |
Out-of-sample demand rate. |
order |
Moving averages orders for demand and interval. |
component |
List of c.in and c.out containing the non-zero demand and interval vectors for in- and out-of-sample respectively. Third element is the coefficient used to scale demand rate for sba and sbj. |
Nikolaos Kourentzes
Optimisation cost functions described in: N. Kourentzes, 2014, On intermittent demand model optimisation and selection, International Journal of Production Economics, 156: 180-190. doi: 10.1016/j.ijpe.2014.06.007.
crost
, tsb
, sexsm
.
crost.ma(ts.data1,outplot=TRUE)
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