Merging - Looping data to changing ind/month data to ind/quarter

I have a dataframe - "exercise" converted into a long format "exerciselong". The data is in individual/month and now I want to convert it into individual/quarter.
Each subjectid has data for 9 months and now I need to convert it into data for 3 quarter by picking data from 3 month for each quarter. 1st quarter - month1-3, 2nd quarter - month4-6 and 3rd quarter - month7-9

Quick variable summary
"subjectid": individual ID
location: location of the subjectid
month_number : 1-9 for each subjectid, starts at 1 for each
age : age of subjectid
gym : 0 = went to gym, 1 = did not go to gym
ff: no of times subjectid ate fastfood each month
run : no of miles subjectid ran each month

exercise <- data.frame(
  subjectid = c("a","b","c","d","e","f","g","h","i","j","k"),
  location = c("NY","NC","WA","WA","OR","CA","AR","KS","AZ","VT","MA"),
  age1 = c(27,18,28,14,11,32,20,19,12,23,34),
  age2 = c(28,19,29,15,12,33,21,20,13,24,35),
  age3 = c(29,20,30,16,13,34,22,21,14,25,36),
  age4 = c(30,21,31,17,14,35,23,22,15,26,37),
  age5 = c(31,22,32,18,15,36,24,23,16,27,38),
  age6 = c(32,23,33,19,16,37,25,24,17,28,39),
  age7 = c(33,24,34,20,17,38,26,25,18,29,40),
  age8 = c(34,25,35,21,18,39,27,26,19,30,41),
  age9 = c(35,26,36,22,19,40,28,27,20,31,42),
  gym1 = c(1,0,0,1,0,0,0,1,0,0,0),
  gym2 = c(1,0,0,1,0,0,0,1,0,0,0),
  gym3 = c(1,1,0,1,0,0,1,1,1,0,0),
  gym4 = c(1,1,0,1,0,0,1,1,1,1,1),
  gym5 = c(0,1,0,1,0,0,0,1,1,1,1),
  gym6 = c(1,1,0,1,0,0,1,1,0,1,0),
  gym7 = c(1,1,0,0,1,0,1,0,0,1,1),
  gym8 = c(1,1,0,0,1,0,1,0,0,1,1),
  gym9 = c(1,1,0,0,1,0,1,0,0,1,1),
  ff1 = c(11,18,16,10,20,12,5,9,0,8,3),
  ff2 = c(16,14,17,7,3,0,1,4,8,5,12),
  ff3 = c(3,20,6,0,9,16,10,17,19,9,13),
  ff4 = c(5,3,15,0,3,16,6,8,10,7,17),
  ff5 = c(8,7,20,0,2,3,17,0,1,16,15),
  ff6 = c(4,8,14,0,1,20,5,0,6,10,9),
  ff7 = c(2,4,7,11,11,10,15,6,20,13,16),
  ff8 = c(16,9,12,3,41,19,15,12,6,20,11),
  ff9 = c(12,1,22,17,18,13,2,5,3,19,7),
  run1 = c(17,16,16,0,20,12,58,89,9,12,15),
  run2 = c(3,14,17,7,30,0,1,48,45,50,11),
  run3 = c(12,22,6,0,17,16,10,17,19,69,67),
  run4 = c(34,32,15,19,9,16,6,8,10,7,16),
  run5 = c(45,17,20,10,21,38,017,0,1,16,34),
  run6 = c(1,2,14,7,17,2,57,0,6,10,15),
  run7 = c(0,14,7,19,11,101,15,6,20,13,17),
  run8 = c(9,9,13,3,4,23,11,12,6,20,12),
  run9 = c(11,12,11,17,19,15,2,5,3,19,72)

exerciselong <- pivot_longer(data = exercise,cols = age1:run9,
             names_pattern = "([^\\d]+)(\\d+)",
             names_to = c(".value","month_number"))

To convert it into person/quarter from person/month, I am trying to use the following conversion strategy

age = age of the first month of the quarter. e.g for subjectid "a" for quarter 1 = 27, quarter 2 = 30 and quarter 3 = 32 (I know this does not make sense but this is just an example data)
gym = If subjectid went at least twice, then gym/quarter = yes(or 1), if <2 : gym/quarter = no(or 0)
ff = sum of ff each quarter, e.g. for a ff for quarter 1 = 11+16+3 = 30, quarter 2 = 5+8+4 = 17, quarter 3 = 2 + 16+12 = 30
run = highest value (mode) of each quarter. e.g. for subjectid "a", quarter 1 = 17, quarter 2 = 45 and quarter 3 = 11

This is how I want my final data to look
Screen Shot 2021-12-28 at 9.35.33 AM

Thank you for the help !

Hi there! Hope this is helpful. This would follow the code that you provided.

By "mode", do you mean "max"?


exercise_quat <-
  exerciselong %>% 
    q1 = case_when(month_number %in% c("1", "2", "3") ~ 1,
                   month_number %in% c("4", "5", "6") ~ 2,
                   month_number %in% c("7", "8", "9") ~ 3)) %>% 
  summarise(age_quat = min(age),
            gym_quat = sum(gym),
            ff_quat = sum(ff),
            run_quat = max(run)) %>% 
  mutate(gym_quat = case_when(gym_quat >= 2 ~ "Yes",
                              TRUE ~ "No"))
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Thank you @_shortessay !

This is great. It worked perfectly on the example dataset and yes by mode I meant the max.

I had a follow-up question and wanted to get your suggestion. In my actual data, the data is not perfectly structured as in the example. For example ( I tried to recreate in the data frame below "exerciselongV1"), some subjectid enter the dataset only on month"3" for subjectid "f" i.e end of first quarter or month5 :subjectid "g", i.e during the 2nd quarter, or some subjectid leave the dataset early e.g. subjectid "a" on month6.

I created a variable "entry_mnt" to show which month they enter the dataset.

Under this condition, to do similar conversion that you showed, do you suggest?
a. Creating rows 1-9 for each subjectid even if they do not have data (entered late or left early) and just keep the values NA? "e.g. "exerciselongV1"
b. Or is there a better way to do this without having to create the NA's/do the step a? (E.g "exerciselongV2")

The format I have is the second one - "exerciselongV2" so that is preferable.
I have a large sample ~ 8000 sampleid and the quarter goes upto quarter 100 so wanted to check if there is an easier way of doing this?

Thank you again for your time. This is super helpful !

exerciseV1 <- data.frame(
  subjectid = c("a","b","c","d","e","f","g","h","i","j","k"),
  location = c("NY","NC","WA","WA","OR","CA","AR","KS","AZ","VT","MA"),
  entry_mnt1 = c(0,1,1,1,0,0,0,1,1,1,1),
  entry_mnt2 = c(2,2,2,2,2,0,0,2,2,2,2),
  entry_mnt3 = c(3,3,3,3,3,3,0,3,3,3,3),
  entry_mnt4 = c(4,4,4,4,4,4,0,4,4,4,4),
  entry_mnt5 = c(5,5,5,5,5,5,5,5,5,5,5),
  entry_mnt6 = c(0,6,6,6,6,6,6,6,6,6,6),
  entry_mnt7 = c(0,7,7,7,7,7,7,7,7,7,7),
  entry_mnt8 = c(0,8,8,8,8,8,8,8,8,8,8),
  entry_mnt9 = c(0,9,9,9,9,9,9,9,9,9,9),
  age1 = c(NA,18,28,14,NA,NA,NA,19,12,23,34),
  age2 = c(28,19,29,15,12,NA,NA,20,13,24,35),
  age3 = c(29,20,30,16,13,34,NA,21,14,25,36),
  age4 = c(30,21,31,17,14,35,NA,22,15,26,37),
  age5 = c(31,22,32,18,15,36,24,23,16,27,38),
  age6 = c(NA,23,33,19,16,37,25,24,17,28,39),
  age7 = c(NA,24,34,20,17,38,26,25,18,29,40),
  age8 = c(NA,25,35,21,18,39,27,26,19,30,41),
  age9 = c(NA,26,36,22,19,40,28,27,20,31,42),
  gym1 = c(NA,0,0,1,NA,NA,NA,1,0,0,0),
  gym2 = c(1,0,0,1,0,NA,NA,1,0,0,0),
  gym3 = c(1,1,0,1,0,0,NA,1,1,0,0),
  gym4 = c(1,1,0,1,0,0,NA,1,1,1,1),
  gym5 = c(0,1,0,1,0,0,0,1,1,1,1),
  gym6 = c(NA,1,0,1,0,0,1,1,0,1,0),
  gym7 = c(NA,1,0,0,1,0,1,0,0,1,1),
  gym8 = c(NA,1,0,0,1,0,1,0,0,1,1),
  gym9 = c(NA,1,0,0,1,0,1,0,0,1,1),
  ff1 = c(NA,18,16,10,NA,NA,NA,9,0,8,3),
  ff2 = c(16,14,17,7,3,NA,NA,4,8,5,12),
  ff3 = c(3,20,6,0,9,16,NA,17,19,9,13),
  ff4 = c(5,3,15,0,3,16,NA,8,10,7,17),
  ff5 = c(8,7,20,0,2,3,17,0,1,16,15),
  ff6 = c(NA,8,14,0,1,20,5,0,6,10,9),
  ff7 = c(NA,4,7,11,11,10,15,6,20,13,16),
  ff8 = c(NA,9,12,3,41,19,15,12,6,20,11),
  ff9 = c(NA,1,22,17,18,13,2,5,3,19,7),
  run1 = c(NA,16,16,0,NA,NA,NA,89,9,12,15),
  run2 = c(3,14,17,7,30,NA,NA,48,45,50,11),
  run3 = c(12,22,6,0,17,16,NA,17,19,69,67),
  run4 = c(34,32,15,19,9,16,NA,8,10,7,16),
  run5 = c(45,17,20,10,21,38,017,0,1,16,34),
  run6 = c(NA,2,14,7,17,2,57,0,6,10,15),
  run7 = c(NA,14,7,19,11,101,15,6,20,13,17),
  run8 = c(NA,9,13,3,4,23,11,12,6,20,12),
  run9 = c(NA,12,11,17,19,15,2,5,3,19,72)

exerciselongV1 <- pivot_longer(data = exerciseV1,cols = entry_mnt1:run9,
             names_pattern = "([^\\d]+)(\\d+)",
             names_to = c(".value","month_number"))

exerciselongV2 <- subset(exerciselongV1, entry_mnt ! = "0")

I apologize, I don't think I completely understand where rows 1-9 came from. However, I think what you did makes sense if you need to know whether they were subscribed in month 2, 3, etc. If you only need to know the first and last month, then I'd suggest a entry_mth and an exit_mth but that may not be what you need.

Hi, sorry for the confusion. I created them to show the total months under study month 1 to 9.

For others who are reading this thread as an example, some subjectid don't have data perfectly for month 1 to 9 as they may enter late or leave early

However, I was able to tweak the code you provided and got the result that I wanted.
Thanks a lot @ivelasq3 and Happy New Year !

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