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Holt-Winters to predict next month data with previous 6 months data

Raina Mortuja

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I have sales data from January to June and I want to predict the sales for July using Holt-Winters. I have written a R script that works for monthly data if I have data for an entire year but it does not work for a dataset of 6 months.

I have attached the script and error received to this question.

I would very much appreciate the help.


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