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I have data for daily sales for different brands-A,B,C,D,E,F,G,H . I'm using time series to forecast next 3 months sales. Every time select each brand and run the process is too lengthy and taking time .
Here are some points I need help on :
1. How shall I run time series modelling for multiple brands at same time ?
2. Also for each brand
first I'm running ETS and ARIMA models
Then using TS compare tool selecting model for forecast.
Which is the best criteria to select models ?
for Some models my RMSE,ME values are lower for ETS and for some are lower for ARIMA.
3. How can I automate this process or what should I use so that model will directly select best from the ETS and ARIMA and then forecast the values using best model (ETS/ARIMA).