In table, how to count a number of specific values by year?

조회 수: 3 (최근 30일)
Doheon Lee
Doheon Lee 2021년 6월 30일
댓글: Doheon Lee 2021년 6월 30일
I have a following table.
Date Value win_repeat
___________ _____ __________
20-Nov-2018 0.041 1
21-Nov-2018 0.04 2
29-Nov-2018 0.042 0
11-Feb-2019 0.039 0
21-Mar-2019 0.035 1
02-May-2019 0.048 0
21-Aug-2019 0.045 2
16-Sep-2019 0.04 0
03-Oct-2019 0.038 2
04-Oct-2019 0.037 1
10-Oct-2019 0.035 0
31-Oct-2019 0.034 2
20-Nov-2019 0.034 1
26-Nov-2019 0.034 1
28-Nov-2019 0.033 1
02-Dec-2019 0.033 2
14-Jan-2020 0.034 2
22-Jun-2020 0.022 1
30-Jul-2020 0.023 2
20-Aug-2020 0.03 0
I like to count how many '0', '1', '2' are in the 'win_repeat' column for each year. The expected result is as below.
year_Date win_repeat GroupCount_win_repeat
2018 0 1
2018 1 1
2018 2 1
2019 0 4
2019 1 5
2019 2 4
2020 0 1
2020 1 1
2020 2 2
Firstly, I tried with 'groupcounts', but it only counts a number of rows in the table for each year.
x = groupcounts(T, 'Date', 'year')
x =
3×3 table
year_Date GroupCount Percent
_________ __________ _______
2018 3 15
2019 13 65
2020 4 20
Next, I tried with 'groupsummary', I cannot intput 'count' for the 'method' variable (please note that 'mean' is input for the 'method' varialbe in the follwing example).
x = groupsummary(T, 'Date', 'year', 'mean', 'win_repeat')
x =
3×3 table
year_Date GroupCount mean_win_repeat
_________ __________ _______________
2018 3 1
2019 13 1
2020 4 1.25
Please help with this. Thank you very much in advance.
  댓글 수: 2
Doheon Lee
Doheon Lee 2021년 6월 30일
I already have tried it. But the error comes up.
>> groupsummary(T, 'Date', 'year', @(x) histc(x, unique(x)), 'win_repeat')
Error using groupsummary (line 480)
Unable to apply method 'fun1' to data variable win_repeat.

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채택된 답변

Cris LaPierre
Cris LaPierre 2021년 6월 30일
편집: Cris LaPierre 2021년 6월 30일
The key may be in realizing that you have 2 grouping criteria - year and win_repeat. I added your data to a txt file so I could run this example.
T = readtable("DoheonLeeTable.txt")
T = 20×3 table
Date Value win_repeat ___________ _____ __________ 20-Nov-2018 0.041 1 21-Nov-2018 0.04 2 29-Nov-2018 0.042 0 11-Feb-2019 0.039 0 21-Mar-2019 0.035 1 02-May-2019 0.048 0 21-Aug-2019 0.045 2 16-Sep-2019 0.04 0 03-Oct-2019 0.038 2 04-Oct-2019 0.037 1 10-Oct-2019 0.035 0 31-Oct-2019 0.034 2 20-Nov-2019 0.034 1 26-Nov-2019 0.034 1 28-Nov-2019 0.033 1 02-Dec-2019 0.033 2
% Use groupsummary
x = groupsummary(T, ["Date","win_repeat"],["year","none"])
x = 9×3 table
year_Date win_repeat GroupCount _________ __________ __________ 2018 0 1 2018 1 1 2018 2 1 2019 0 4 2019 1 5 2019 2 4 2020 0 1 2020 1 1 2020 2 2
% Or use groupcounts
y = groupcounts(T, ["Date","win_repeat"],["year","none"])
y = 9×4 table
year_Date win_repeat GroupCount Percent _________ __________ __________ _______ 2018 0 1 5 2018 1 1 5 2018 2 1 5 2019 0 4 20 2019 1 5 25 2019 2 4 20 2020 0 1 5 2020 1 1 5 2020 2 2 10
  댓글 수: 3
Cris LaPierre
Cris LaPierre 2021년 6월 30일
편집: Cris LaPierre 2021년 6월 30일
Correct. You didn't mention needing to apply any function to the groups. This is what the 'method' input is for. You can use one of the predefined methods, or you can call a function you create (example here).
If you don't specify a datavars input, then the method(s) is/are applied to all table variables. Otherwise, it/they are only applied to the indicated variables. Use the same syntax shown for grouping multiple variables to apply multiple methods and to select multiple datavars.
Doheon Lee
Doheon Lee 2021년 6월 30일
Thank you for the more information. No, I did not meant to apply any funciton to the groups., but your reply helps me think further than what I tried to do at the beginning. Once again, thank you so much for the help. :)

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추가 답변 (1개)

Yazan
Yazan 2021년 6월 30일
year = [repmat(2018, [3,1]); repmat(2019, [13,1]); repmat(2020, [4,1])];
win = [1;2;0;0;1;0;2;0;2;1;0;2;1;1;1;2;2;1;2;0];
T = table(year, win);
groupsummary(T, 'year', @(x) {histcounts(x)});

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