# Weekly prediction

I have a year worth of weekly data and I need to predict end of year sales and beginning 2 weeks of next year sales in R.

Date Sales
1/1/2020 2000
1/8/2020 2004
1/15/2020 3001
1/22/2020 2004
1/29/2020 4002
2/5/2020 2003
2/12/2020 5000
2/19/2020 2222
2/26/2020 3300
3/4/2020 6000
3/11/2020 6600
3/18/2020 4003
3/25/2020 5004
4/1/2020 4003
4/8/2020 7003
4/15/2020 7323
4/22/2020 4566
4/29/2020 8000
5/6/2020 8001
5/13/2020 6002
5/20/2020 2001
5/27/2020 4002
6/3/2020 2001
6/10/2020 4003
6/17/2020 8000
6/24/2020 9002
7/1/2020 9002
7/8/2020 8009
7/15/2020 9004
7/22/2020 4003
7/29/2020 1000
8/5/2020 2009
8/12/2020 3099
8/19/2020 4009
8/26/2020 4008
9/2/2020 4001
9/9/2020 2008
9/16/2020 8004
9/23/2020 8003
9/30/2020 8054
10/7/2020 8043
10/14/2020 9087
10/21/2020 9034
10/28/2020 9021
11/4/2020 6004
11/11/2020 6000
11/18/2020 6006
11/25/2020 4009
12/2/2020 4568
12/9/2020 8009
12/16/2020 8006
12/23/2020 8654
12/30/2020 5680
1. I need to take till October month and predict November and December sales
2. I need to predict for next two quarters
3. I need to predict weekly for end of 2020 and beginning of 2021 January

I used

``````past<- window(td, end = c(2020,50))
fit <- tbats(td)
fc <- forecast(fit, h=10)
model1<- HoltWinters(past,seasonal = "additive")
pred<- predict(model1,n.ahead = 10,prediction.interval = T)
``````

but couldnt get the result, either the prediction goes to 2022 or beyond that. any idea how to get this and also suggest whether to use any new method to predict.

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