Hi Monica
An example abbreviated from ?histogram
x = histogram( ~ height, data = singer)
names(x)
# to see what is there
str(x)
# information
x$panel.args.common
$breaks
[1] 59.36 61.28 63.20 65.12 67.04 68.96 70.88 72.80 74.72 76.64
$type
[1] "percent"
$equal.widths
[1] TRUE
$nint
[1] 9
# x$panel.args: name as number
x[[35]]
[[1]]
[[1]]$x
[1] 64 62 66 65 60 61 65 66 65 63 67 65 62 65
68 65 63 65 62 65 66 62 65 63 65 66 65 62 65 66
65 61 65 66 65 62 63 67 60 67 66 62 65 62
[45] 61 62 66 60 65 65 61 64 68 64 63 62 64 62
64 65 60 65 70 63 67 66 65 62 68 67 67 63 67 66
63 72 62 61 66 64 60 61 66 66 66 62 70 65
[89] 64 63 65 69 61 66 65 61 63 64 67 66 68 70
65 65 65 64 66 64 70 63 70 64 63 67 65 63 66 66
64 64 70 70 66 66 66 69 67 65 69 72 71 66
[133] 76 74 71 66 68 67 70 65 72 70 68 64 73 66
68 67 64 68 73 69 71 69 76 71 69 71 66 69 71 71
71 69 70 69 68 70 68 69 72 70 72 69 73 71
[177] 72 68 68 71 66 68 71 73 73 70 68 70 75 68
71 70 74 70 75 75 69 72 71 70 71 68 70 75 72 66
72 70 69 72 75 67 75 74 72 72 74 72 72 74
[221] 70 66 68 75 68 70 72 67 70 70 69 72 71 74 75
etc to suite your requirements
HTH
Regards
Duncan
Duncan Mackay
Department of Agronomy and Soil Science
University of New England
ARMIDALE NSW 2351
Email: home mac...@northnet.com.au
At 23:50 31/08/2011, you wrote:
Hi,
I have a relatively big dataset and I want to construct
some histograms using the histogram function in lattice. One thing I am
interested in is to look at differences between
density and percent. I know I can
use the hist function but it seems that this function gives sometimes some
wrong answers and the density is actually a
percent since it is calculated as counts in the
bin divided by the total no. of points. Let me explain.
If I let the hist function to decide the breaks, or I use
a small number, or one of the pre-determined methods to select breaks then
everything seems to be in order. But if I decide to use for example 100 as
a breaks (I have over 90000 data points so the number of breaks is not
necessarily too large I would think) the density for the first bin is over 1,
although for all the other breaks the density is
actually a percent since it is
the count for that bin divided by the total no.
of points I have. So
. Here it
is something wrong or most probably I am doing something wrong.
If I use the function histogram from lattice it is
obvious that there is a difference between the percent param and the density
param. I looked at the function code and I
didn't understand it to be honest.
It seems it calls inside the hist function, or a slightly modify variant of
hist. Reading about the object trellis I saw I can access different info about
the graph it generates but nothing about the actual data that goes into
defining the histogram. How can I access the data from it?
I am not sure if my problem is platform specific it should
not be but I have Rx64 2.13.1 on windows machine, in case it counts.
I appreciate your help, thanks,
Monica
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