Forecasting based on previous data values and repeating that each week in R

I have this file: a.csv

For example on a.csv, for store 1000 and store 1001, there are values for all 7 days of the week for 3rdparty, dinein, drivethru, digital, and takeout:

store	day of week	3rdparty	dinein	drivethru	digital	takeout
1000	Sunday	1	3	5	7	9
1000	Monday	2	4	6	8	10
1000	Tuesday	3	5	7	9	11
1000	Wednesday	4	6	8	10	12
1000	Thursday	5	7	9	11	13
1000	Friday	6	8	10	12	14
1000	Saturday	7	9	11	13	15
1001	Sunday	8	10	12	14	16
1001	Monday	9	11	13	15	17
1001	Tuesday	10	12	14	16	18
1001	Wednesday	11	13	15	17	19
1001	Thursday	12	14	16	18	20
1001	Friday	13	15	17	19	21
1001	Saturday	14	16	18	20	22

How do you project/forecast these weekly values from 2/21/2021 - 12/25/2021? How can you make this table on R? These values will be repeated weekly and shown for each store:

store	date	3rdparty	dinein	drivethru	digital	takeout
1000	2/21/2021	1	3	5	7	9
1000	2/22/2021	2	4	6	8	10
1000	2/23/2021	3	5	7	9	11
1000	2/24/2021	4	6	8	10	12
1000	2/25/2021	5	7	9	11	13
1000	2/26/2021	6	8	10	12	14
1000	2/27/2021	7	9	11	13	15
1000	2/28/2021	1	3	5	7	9
1000	3/1/2021	2	4	6	8	10
1000	3/2/2021	3	5	7	9	11
1000	3/3/2021	4	6	8	10	12
1000	3/4/2021	5	7	9	11	13
1000	3/5/2021	6	8	10	12	14
1000	3/6/2021	7	9	11	13	15

Any help will be greatly appreciated, thanks in advance!

https://stackoverflow.com/questions/66863672/forecasting-based-on-previous-data-values-and-repeating-that-each-week-in-r March 30, 2021 at 09:31AM