EXAMPLE FORMATTING A HISTOGRAM by rpv32164

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									             DESCRIPTIVE STATISTICS: GRAPHS FOR GROUPS
Suppose this set of data is entered in SPSS

                   GROUP                SCORE            f
                   Group A                1             1
                   Group A                2             2
                   Group A                3             5
                   Group A                4             6
                   Group A                5             5
                   Group A                6             2
                   Group A                7             1
                   Group B                4             2
                   Group B                5             3
                   Group B                6             7
                   Group B                7             11
                   Group B                8             14
                   Group B                9             5


This table really contains two frequency distributions—one for Group A and one for Group B.
Choose Data…Weight Cases.. and weight the cases by f, the frequency.

NOTE: This example will use bar graphs. To make them come out well, you need to use
zero decimal places on the variable.
      GRAPHING BOTH GROUPS COMBINED: Bar Graphs

      1) Here’s a bar graph for both groups combined.

            16


            14


            12


            10


             8


             6


             4


             2
Count




             0
                          1       2       3       4       5       6       7       8       9


                 X

                 Cas es weight ed by F



      We see, for example, that the score 8, which occurred 14 times, is the mode.

      2) Below is the same graph, except “% of cases” has been chosen for the vertical axis.


                 30




                 20




                 10
Percent




                 0
                              1       2       3       4       5       6       7       8       9


                      X

                      Cas es weight ed by F
        GRAPHING BOTH GROUPS COMBINED: Line Graphs

        3) Here’s a bar graph for both groups combined.

              16


              14


              12


              10


               8


               6


               4


               2
    Count




               0
                   1            2         3            4       5       6       7       8       9


                   X

                   Cas es weighted by F


        We see, for example, that the score 8, which occurred 14 times, is the mode.

        4) Below is the same graph, except “% of cases” has been chosen for the vertical axis.

              30
                   30




              20 20




              10 10
 Percent
Percent




                       0
               0
                                 1       2         3       4       5       6   7   8       9
                   1            2         3            4       5       6       7       8       9
                           X
                   X
                           Cas es weight ed by F
                   Cas es weighted by F
        GRAPHING GROUPS SEPARATELY: Bar Graphs

        5) Here’s a bar graph showing the groups separately. This is called a clustered bar graph,
           with clusters defined by group. We see that the scores are higher for Group B, the
           frequencies are higher, and the shape is different.

              16


              14


              12


              10


               8


               6


               4                                                                        GROUP

               2                                                                            Group A
    Count




               0                                                                            Group B
                         1        2    3        4   5       6       7       8       9


                   X

                   Cas es weighted by F




        6) Below is the same graph, except “% of cases” has been chosen for the vertical axis. The
           percent is the computed separately for the two groups, e.g., about 35% of Group B
           scored 8.

              40
                   30




              30

                   20



              20


                   10

              10                                                                        GROUP
 Percent
Percent




                                                                                            Group A
                   0
               0                                                                            Group B
                              1       2         3       4       5       6       7       8    9
                         1        2    3        4   5       6       7       8       9
                        X
                   X
                        Cas es weight ed by F
                   Cas es weighted by F
GRAPHING GROUPS SEPARATELY: Line Graphs

7) Here’s a line graph showing the groups separately. This is called a multiple line graph,
   with lines defined by group. We see that the scores are higher for Group B, the
   frequencies are higher, and the shape is different.

                  16


                  14


                  12


                  10


                  8


                  6


                  4                                                    GROUP

                  2                                                      Group A
          Count




                  0                                                      Group B
                       1      2       3        4   5   6   7   8   9


                       X

                       Cas es weight ed by F




8) Below is the same graph, except “% of cases” has been chosen for the vertical axis. The
   percent is the computed separately for the two groups, e.g., about 35% of Group B
   scored 8.



                  40




                  30




                  20




                  10                                                   GROUP
Percent




                                                                         Group A

                  0                                                      Group B
                       1      2       3        4   5   6   7   8   9


                       X

                       Cas es weight ed by F
HOW TO CREATE GRAPHS FOR GROUPS



OBTAINING GRAPH 5: CLUSTERED BAR GRAPH

  Choose Graphs…Bar…,

     In the Bar Charts box

           Choose Clustered and Summaries for groups of cases

           Click on Define

           In the Define Clustered Bar box

                 Choose N of Cases in the Lines Represent box

                 Move x to the Category Axis box

                 Move group to the Define Clusters by box

                 Click on OK



OBTAINING GRAPH 7: MULTIPLE LINE GRAPH

  Choose Graphs…Line…,

     In the Line Charts box

           Choose Multiple and Summaries for groups of cases

           Click on Define

           In the Define Multiple Lines box

                 Choose N of Cases in the Lines Represent box

                 Move x to the Category Axis box

                 Move group to the Define Lines by box

                 Click on OK

								
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