I tried to reproduce the histogram that PSPP created in R. As you can
see on the attached files, R also created a histogram with gaps if the
number of classes is too high (here: 16 which is similar to the number
PSPP used), but a histogram with no gaps if the number of classes is
lower (10 classes). So, another aspect in addition to the necessary
distinction between histogram and bar chart is the choice of an
appropriate number of classes.
Kind regards,
Oliver Walter
Am 06.08.2017 um 14:37 schrieb Dr. Oliver Walter:
Dear Sir or Madam,
I've just read your message in the PSPP list. One problem is that your
data are discrete with a small number of categories, but histograms
are most useful for continuous data. For discrete data with a small
number of categories, a bar chart is more appropriate. I attached you
a pdf file which contains a histogram of your data (variable x), a
histogram of continuous data (variable y) and a bar chart of your data
(variable x). Obviously, the histogram is most appropriate for the
continuous data (variable y), but a bar chart is most appropriate for
discrete data (variable x).
Bonne journée,
Oliver Walter
Am 06.08.2017 um 11:57 schrieb ftr public:
Hi,
I want to graph a simple frequency distribution of ta variable called
soctrust from a national sample. I compare the histogram from a
FREQUENCIES command with a diagramme from a GRAPH command.
The variable can have integer values from 0 to 10.
FREQUENCIES
/VARIABLES= soctrust
/FORMAT=AVALUE TABLE
/STATISTICS=NONE
/HISTOGRAM=NORMAL.
Graph /histogram (Normal) = soctrust.
The resulting graphs are different, but both are deficient. This is
the frequency distribution.
Valeur
Fréquence
0
115
1
36
2
164
3
243
4
226
5
482
6
236
7
256
8
114
9
27
10
17
The GRAPH procedure gives the annexed histogram dp-1.png.
The FREQUENCIES procedure gives the annexed histogram dp-1.png.
What is surprising is that the two procedures give different graphs,
and that in both the data are not truthfully mirrored by the
visualisation. There should be no empty space between two values.
Regards,
-ftr
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