HoltWinters smoothing parameters - alpha = 1 beta = 0 gamma = 0
I am trying to use HoltWinters(in R) on the below time series data. As can be seen, it has trend + seasonality. I have 25 monthly data points.
But on checking the object returned by HoltWinters() function, below is what I get.
What is causing the alpha, beta, gamma to be at extremes? What can I do to fix this?
looks ok to me.
beta=0 means the fitted trend was good for the entire window of data, rather than needing a smooth adjustment from step to step. your graph looks like a good fit to a line after deseasonalization.
alpha=1 says the trend value does not affect the (unobserved) level -- trend is merely an offset to the (observed) y that steadily increases over time, and does not feed back into the system state.
how did you generate this timeseries?
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