This is my transaction data.
data
id from to date amount
<int> <fctr> <fctr> <date> <dbl>
19521 6644 6934 2005-01-01 700.0
19524 6753 8456 2005-01-01 600.0
19523 9242 9333 2005-01-01 1000.0
… … … … …
1056317 7819 7454 2010-12-31 60.2
1056318 6164 7497 2010-12-31 107.5
1056319 7533 7492 2010-12-31 164.1
For each unique date in date column, I want to determine a date interval, which is the last 6 month prior to that specified unique date. For example, to determine the last 6 month period prior to the date "2005-01-01", I subtract 180 days from "2005-01-01" to get "2004-07-05". Hence, the interval "2004-07-05"-"2005-01-01" is the last 6 month period prior to the date "2005-01-01". So, I create a new column date_minus_180 accordingly as follows:
id from to date date_minus_180 amount
<int> <fctr> <fctr> <date> <date> <dbl>
19521 6644 6934 2005-01-01 2004-07-05 700.0
19522 9843 9115 2005-01-01 2004-07-05 900.0
19523 9242 9333 2005-01-01 2004-07-05 1000.0
19524 6753 8456 2005-01-01 2004-07-05 600.0
19525 7075 6510 2005-01-02 2004-07-06 400.0
19526 8685 7207 2005-01-02 2004-07-06 1100.0
19527 5513 6046 2005-01-03 2004-07-07 600.0
19528 6340 7047 2005-01-03 2004-07-07 1100.0
19529 6042 6213 2005-01-03 2004-07-07 200.0
19530 5587 9493 2005-01-03 2004-07-07 800.0
...
Now what I want to do is to get sub-dataframes by splitting the data based on each unique date intervals. That is, considering the first date interval "2004-07-05"-"2005-01-01", we'll have a sub-dataframe containing observations where the date in date column is in the range of this date interval. Since the date in my data is in ascending order, thus the very first date is "2005-01-01". So, the first sub-dataframe will consist of the first 4 observations, since the date "2005-01-01" in the date column of these observations is in the range of the interval "2004-07-05"-"2005-01-01". Similarly, considering the second date interval "2004-07-06"-"2005-01-02", we'll have a sub-dataframe containing observations where the date in the date column is in the range of this date interval. So, the second sub-dataframe will consist of the first 6 observations since the dates "2005-01-01" and "2005-01-02" are in the range of the interval "2004-07-06"-"2005-01-02". So, continuing in this manner, how can I form multiple sub-dataframes based on these specified date intervals?
Let's again consider the interval "2004-07-05"-"2005-01-01". For this particular interval, we can subset the data as follows:
data[data$date >= "2004-07-05" & data$date <= "2005-01-01",]
giving the output:
id from to date date_minus_180 amount
<int> <fctr> <fctr> <date> <date> <dbl>
19521 6644 6934 2005-01-01 2004-07-05 700.0
19522 9843 9115 2005-01-01 2004-07-05 900.0
19523 9242 9333 2005-01-01 2004-07-05 1000.0
19524 6753 8456 2005-01-01 2004-07-05 600.0
So, how to subset the data in just one go for all the intervals?
a sample from the data:
structure(list(id = c(18529L, 13742L, 9913L, 956L, 2557L, 1602L,
18669L, 35900L, 48667L, 51341L, 53713L, 60126L, 60545L, 65113L,
66783L, 83324L, 87614L, 88898L, 89874L, 94765L, 100277L, 101587L,
103444L, 108414L, 113319L, 121516L, 126607L, 130170L, 131771L,
135002L, 149431L, 157403L, 157645L, 158831L, 162597L, 162680L,
163901L, 165044L, 167082L, 168562L, 168940L, 172578L, 173031L,
173267L, 177507L, 179167L, 182612L, 183499L, 188171L, 189625L,
193940L, 198764L, 199342L, 200134L, 203328L, 203763L, 204733L,
205651L, 209672L, 210242L, 210979L, 214532L, 214741L, 215738L,
216709L, 220828L, 222140L, 222905L, 226133L, 226527L, 227160L,
228193L, 231782L, 232454L, 233774L, 237836L, 237837L, 238860L,
240223L, 245032L, 246673L, 247561L, 251611L, 251696L, 252663L,
254410L, 255126L, 255230L, 258484L, 258485L, 259309L, 259910L,
260542L, 262091L, 264462L, 264887L, 264888L, 266125L, 268574L,
272959L), from = c("5370", "5370", "5370", "8605", "5370", "6390",
"5370", "5370", "8934", "5370", "5635", "6046", "5680", "8026",
"9037", "5370", "7816", "8046", "5492", "8756", "5370", "9254",
"5370", "5370", "7078", "6615", "5370", "9817", "8228", "8822",
"5735", "7058", "5370", "8667", "9315", "6053", "7990", "8247",
"8165", "5656", "9261", "5929", "8251", "5370", "6725", "5370",
"6004", "7022", "7442", "5370", "8679", "6491", "7078", "5370",
"5370", "5370", "5658", "5370", "9296", "8386", "5370", "5370",
"5370", "9535", "5370", "7541", "5370", "9621", "5370", "7158",
"8240", "5370", "5370", "8025", "5370", "5370", "5370", "6989",
"5370", "7059", "5370", "5370", "5370", "9121", "5608", "5370",
"5370", "7551", "5370", "5370", "5370", "5370", "9163", "9362",
"6072", "5370", "5370", "5370", "5370", "5370"), to = c("9356",
"5605", "8567", "5370", "5636", "5370", "8933", "8483", "5370",
"7626", "5370", "5370", "5370", "5370", "5370", "9676", "5370",
"5370", "5370", "5370", "9105", "5370", "9772", "6979", "5370",
"5370", "7564", "5370", "5370", "5370", "5370", "5370", "8744",
"5370", "5370", "5370", "5370", "5370", "5370", "5370", "5370",
"5370", "5370", "7318", "5370", "8433", "5370", "5370", "5370",
"7122", "5370", "5370", "5370", "8566", "6728", "9689", "5370",
"8342", "5370", "5370", "5614", "5596", "5953", "5370", "7336",
"5370", "7247", "5370", "7291", "5370", "5370", "6282", "7236",
"5370", "8866", "8613", "9247", "5370", "6767", "5370", "9273",
"7320", "9533", "5370", "5370", "8930", "9343", "5370", "9499",
"7693", "7830", "5392", "5370", "5370", "5370", "7497", "8516",
"9023", "7310", "8939"), date = structure(c(12934, 13000, 13038,
13061, 13099, 13113, 13117, 13179, 13238, 13249, 13268, 13296,
13299, 13309, 13314, 13391, 13400, 13404, 13409, 13428, 13452,
13452, 13460, 13482, 13493, 13518, 13526, 13537, 13542, 13544,
13596, 13616, 13617, 13626, 13633, 13633, 13639, 13642, 13646,
13656, 13660, 13664, 13667, 13669, 13677, 13686, 13694, 13694,
13707, 13716, 13725, 13738, 13739, 13746, 13756, 13756, 13756,
13761, 13769, 13770, 13776, 13786, 13786, 13786, 13791, 13799,
13806, 13813, 13817, 13817, 13817, 13822, 13829, 13830, 13836,
13847, 13847, 13847, 13852, 13860, 13866, 13871, 13878, 13878,
13878, 13882, 13883, 13883, 13887, 13887, 13888, 13889, 13890,
13891, 13895, 13896, 13896, 13899, 13905, 13909), class = "Date"),
amount = c(24.4, 7618, 21971, 5245, 2921, 8000, 169.2, 71.5,
14.6, 4214, 14.6, 13920, 14.6, 24640, 1600, 261.1, 16400,
3500, 2700, 19882, 182, 14.6, 16927, 25653, 3059, 2880, 9658,
4500, 12480, 14.6, 1000, 3679, 34430, 12600, 14.6, 19.2,
4900, 826, 3679, 2100, 38000, 79, 11400, 21495, 3679, 200,
14.6, 100.6, 3679, 5300, 108.9, 3679, 2696, 7500, 171.6,
14.6, 99.2, 2452, 3679, 3218, 700, 69.7, 14.6, 91.5, 2452,
3679, 2900, 17572, 14.6, 14.6, 90.5, 2452, 49752, 3679, 1900,
14.6, 870, 85.2, 2452, 3679, 1600, 540, 14.6, 14.6, 79, 210,
2452, 28400, 720, 180, 420, 44289, 489, 3679, 840, 2900,
150, 870, 420, 14.6)), row.names = c(NA, -100L), class = "data.frame")