How to group a dataframe and summarize over subgroups of consecutive numbers in Python?











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I have a dataframe with a column containing ids and other column containing numbers:



df1 = {'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]}


You may note that each Id has their correponding series of consecutive numbers in the column "Number". For example:



Id 400 contains a series of length 4 {1, 2, 3, 4} and another of length 2 {8, 9}



I´d like to obtain for each Id, the average length of their corresponding series.
In this example:



df2 = {'ID':[400, 500], 'avg_length':[3, 2]}


Any ideas will be much appreciated!










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    up vote
    3
    down vote

    favorite












    I have a dataframe with a column containing ids and other column containing numbers:



    df1 = {'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
    'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]}


    You may note that each Id has their correponding series of consecutive numbers in the column "Number". For example:



    Id 400 contains a series of length 4 {1, 2, 3, 4} and another of length 2 {8, 9}



    I´d like to obtain for each Id, the average length of their corresponding series.
    In this example:



    df2 = {'ID':[400, 500], 'avg_length':[3, 2]}


    Any ideas will be much appreciated!










    share|improve this question
























      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      I have a dataframe with a column containing ids and other column containing numbers:



      df1 = {'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
      'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]}


      You may note that each Id has their correponding series of consecutive numbers in the column "Number". For example:



      Id 400 contains a series of length 4 {1, 2, 3, 4} and another of length 2 {8, 9}



      I´d like to obtain for each Id, the average length of their corresponding series.
      In this example:



      df2 = {'ID':[400, 500], 'avg_length':[3, 2]}


      Any ideas will be much appreciated!










      share|improve this question













      I have a dataframe with a column containing ids and other column containing numbers:



      df1 = {'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
      'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]}


      You may note that each Id has their correponding series of consecutive numbers in the column "Number". For example:



      Id 400 contains a series of length 4 {1, 2, 3, 4} and another of length 2 {8, 9}



      I´d like to obtain for each Id, the average length of their corresponding series.
      In this example:



      df2 = {'ID':[400, 500], 'avg_length':[3, 2]}


      Any ideas will be much appreciated!







      python pandas pandas-groupby group-summaries






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      share|improve this question










      asked Nov 21 at 16:29









      Facundo Iannello

      182




      182
























          2 Answers
          2






          active

          oldest

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          up vote
          1
          down vote



          accepted










          Here is one way, uses groupby twice,



          df1['tmp'] = (df1.Number - df1.Number.shift() > 1).cumsum()

          df1.groupby(['ID', 'tmp']).Number.count().groupby(level = 0).mean().reset_index(name = 'avg_length')

          2.29 ms ± 75.8 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

          ID avg_length
          0 400 3
          1 500 2


          Option 2: Without using apply twice, still uses tmp column created earlier



          df1.groupby('ID').tmp.apply(lambda x: x.value_counts().mean()).reset_index(name = 'avg_length')

          2.25 ms ± 99.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)





          share|improve this answer






























            up vote
            1
            down vote














            groupby + cumsum + value_counts



            You can use groupby with a custom function:



            df = pd.DataFrame({'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
            'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]})

            def mean_count(x):
            return (x - x.shift()).ne(1).cumsum().value_counts().mean()

            res = df.groupby('ID')['Number'].apply(mean_count).reset_index()

            print(res)

            ID Number
            0 400 3.0
            1 500 2.0





            share|improve this answer





















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              2 Answers
              2






              active

              oldest

              votes








              2 Answers
              2






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes








              up vote
              1
              down vote



              accepted










              Here is one way, uses groupby twice,



              df1['tmp'] = (df1.Number - df1.Number.shift() > 1).cumsum()

              df1.groupby(['ID', 'tmp']).Number.count().groupby(level = 0).mean().reset_index(name = 'avg_length')

              2.29 ms ± 75.8 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

              ID avg_length
              0 400 3
              1 500 2


              Option 2: Without using apply twice, still uses tmp column created earlier



              df1.groupby('ID').tmp.apply(lambda x: x.value_counts().mean()).reset_index(name = 'avg_length')

              2.25 ms ± 99.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)





              share|improve this answer



























                up vote
                1
                down vote



                accepted










                Here is one way, uses groupby twice,



                df1['tmp'] = (df1.Number - df1.Number.shift() > 1).cumsum()

                df1.groupby(['ID', 'tmp']).Number.count().groupby(level = 0).mean().reset_index(name = 'avg_length')

                2.29 ms ± 75.8 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

                ID avg_length
                0 400 3
                1 500 2


                Option 2: Without using apply twice, still uses tmp column created earlier



                df1.groupby('ID').tmp.apply(lambda x: x.value_counts().mean()).reset_index(name = 'avg_length')

                2.25 ms ± 99.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)





                share|improve this answer

























                  up vote
                  1
                  down vote



                  accepted







                  up vote
                  1
                  down vote



                  accepted






                  Here is one way, uses groupby twice,



                  df1['tmp'] = (df1.Number - df1.Number.shift() > 1).cumsum()

                  df1.groupby(['ID', 'tmp']).Number.count().groupby(level = 0).mean().reset_index(name = 'avg_length')

                  2.29 ms ± 75.8 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

                  ID avg_length
                  0 400 3
                  1 500 2


                  Option 2: Without using apply twice, still uses tmp column created earlier



                  df1.groupby('ID').tmp.apply(lambda x: x.value_counts().mean()).reset_index(name = 'avg_length')

                  2.25 ms ± 99.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)





                  share|improve this answer














                  Here is one way, uses groupby twice,



                  df1['tmp'] = (df1.Number - df1.Number.shift() > 1).cumsum()

                  df1.groupby(['ID', 'tmp']).Number.count().groupby(level = 0).mean().reset_index(name = 'avg_length')

                  2.29 ms ± 75.8 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

                  ID avg_length
                  0 400 3
                  1 500 2


                  Option 2: Without using apply twice, still uses tmp column created earlier



                  df1.groupby('ID').tmp.apply(lambda x: x.value_counts().mean()).reset_index(name = 'avg_length')

                  2.25 ms ± 99.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)






                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited Nov 21 at 17:00

























                  answered Nov 21 at 16:48









                  Vaishali

                  16.9k3927




                  16.9k3927
























                      up vote
                      1
                      down vote














                      groupby + cumsum + value_counts



                      You can use groupby with a custom function:



                      df = pd.DataFrame({'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
                      'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]})

                      def mean_count(x):
                      return (x - x.shift()).ne(1).cumsum().value_counts().mean()

                      res = df.groupby('ID')['Number'].apply(mean_count).reset_index()

                      print(res)

                      ID Number
                      0 400 3.0
                      1 500 2.0





                      share|improve this answer

























                        up vote
                        1
                        down vote














                        groupby + cumsum + value_counts



                        You can use groupby with a custom function:



                        df = pd.DataFrame({'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
                        'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]})

                        def mean_count(x):
                        return (x - x.shift()).ne(1).cumsum().value_counts().mean()

                        res = df.groupby('ID')['Number'].apply(mean_count).reset_index()

                        print(res)

                        ID Number
                        0 400 3.0
                        1 500 2.0





                        share|improve this answer























                          up vote
                          1
                          down vote










                          up vote
                          1
                          down vote










                          groupby + cumsum + value_counts



                          You can use groupby with a custom function:



                          df = pd.DataFrame({'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
                          'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]})

                          def mean_count(x):
                          return (x - x.shift()).ne(1).cumsum().value_counts().mean()

                          res = df.groupby('ID')['Number'].apply(mean_count).reset_index()

                          print(res)

                          ID Number
                          0 400 3.0
                          1 500 2.0





                          share|improve this answer













                          groupby + cumsum + value_counts



                          You can use groupby with a custom function:



                          df = pd.DataFrame({'ID':[400, 400, 400, 400, 400, 400, 500, 500, 500, 500], 
                          'Number':[1, 2, 3, 4, 8, 9, 22, 23, 26, 27]})

                          def mean_count(x):
                          return (x - x.shift()).ne(1).cumsum().value_counts().mean()

                          res = df.groupby('ID')['Number'].apply(mean_count).reset_index()

                          print(res)

                          ID Number
                          0 400 3.0
                          1 500 2.0






                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered Nov 21 at 16:56









                          jpp

                          87k194999




                          87k194999






























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