user36176 - 1 year ago 131

R Question

I have yearly time series data in a long format at a Group-State-Brand level. I want to apply a function that would calculate the growth rates YOY for every level.

basically the (currentvalue/previous value) -1

Find below an extract of the data:

`Grp Sta Brnd Yr Sls`

A AL Ben's 2012 29770

A AL Ben's 2013 23357

A AL Ben's 2014 22442

A AL Ben's 2015 21848

A AL Ben's 2016 13799

B CA Scott's 2012 1079

B CA Scott's 2013 11178

B CA Scott's 2014 14778

B CA Scott's 2015 15241

B CA Scott's 2016 10569

C TX Joey's 2012 1673

C TX Joey's 2013 1290

C TX Joey's 2014 899

C TX Joey's 2015 732

C TX Joey's 2016 294

Basically, each unique level of grp-state-brand is 5 rows.

`Grp Sta Brnd Yr Sls Grwth`

A AL Ben's 2012 29770

A AL Ben's 2013 23357 -22%

A AL Ben's 2014 22442 -4%

A AL Ben's 2015 21848 -3%

A AL Ben's 2016 13799 -37%

B CA Scott's 2012 1079

B CA Scott's 2013 11178 936%

B CA Scott's 2014 14778 32%

B CA Scott's 2015 15241 3%

B CA Scott's 2016 10569 -23%

C TX Joey's 2012 1673

C TX Joey's 2013 1290 -23%

C TX Joey's 2014 899 -30%

C TX Joey's 2015 732 -19%

C TX Joey's 2016 294 -60%

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Answer Source

```
df=data.frame(Grp = c(rep("A",5),rep("B",5),rep("C",5)), Sta = c(rep("AL",5),rep("CA",5),rep("TX",5)),
Brnd = c(rep("Ben's",5),rep("Scott's",5),rep("Joey's",5)),
Yr=rep(c(2012,2013,2014,2015,2016),3),
Sls = c(29770,23357,22442,21848,13799,1079,11178,14778,15241,10569,1673,1290,899,732,294))
ddply(df, .(Grp,Sta,Brnd),mutate, y = sprintf("%.2f%%",c(NA,100*diff(Sls)/Sls[-length(Sls)])))
Grp Sta Brnd Yr Sls y
1 A AL Ben's 2012 29770 NA%
2 A AL Ben's 2013 23357 -21.54%
3 A AL Ben's 2014 22442 -3.92%
4 A AL Ben's 2015 21848 -2.65%
5 A AL Ben's 2016 13799 -36.84%
6 B CA Scott's 2012 1079 NA%
7 B CA Scott's 2013 11178 935.96%
8 B CA Scott's 2014 14778 32.21%
9 B CA Scott's 2015 15241 3.13%
10 B CA Scott's 2016 10569 -30.65%
11 C TX Joey's 2012 1673 NA%
12 C TX Joey's 2013 1290 -22.89%
13 C TX Joey's 2014 899 -30.31%
14 C TX Joey's 2015 732 -18.58%
15 C TX Joey's 2016 294 -59.84%
```

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