Statistic: class interval?
03-06-2015, 11:11 PM
Post: #1
 salvomic Senior Member Posts: 1,396 Joined: Jan 2015
Statistic: class interval?
hi,
I need help (or a tutorial, if there is one) to represent a table divided into "class intervals" and frequencies (or class intervals for a var and another variable, if it possible, in Statistics 1var or statistic 2var...
Or hints to "disaggregate" data to analyze with Prime apps...

i.e. w have
x_i 0-10, 11-20, 21-30, 31-40 (intervals)
n_i 1, 3, 2, 1 (frequencies)

or
x_1 0-10, 11-20, 21-30, 31-40 (class intervals)
y_1 30, 24, 60, 22 (data)

thanks

Salvo

∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib
03-07-2015, 12:56 AM
Post: #2
 Helge Gabert Senior Member Posts: 467 Joined: Dec 2013
RE: Statistic: class interval?
The built in Histogram in Stats 1Var doesn't do it? Look at H1-H5 (there is a provision for a frequency column as well).
03-07-2015, 06:10 AM
Post: #3
 salvomic Senior Member Posts: 1,396 Joined: Jan 2015
RE: Statistic: class interval?
(03-07-2015 12:56 AM)Helge Gabert Wrote:  The built in Histogram in Stats 1Var doesn't do it? Look at H1-H5 (there is a provision for a frequency column as well).

histograms are ok and handle frequencies, but I mean: I have data in which X is expressed as class interval (ex. classes of age), I need a method to input data to calculate statistics...
0-12 3
13-24 4
25-30 6
31-40 4
...
then make statistics on X and frequencies (or, in 2var stat, also on Y)...

thanks
Salvo

∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib
03-07-2015, 06:27 AM
Post: #4
 Tim Wessman Senior Member Posts: 2,293 Joined: Dec 2013
RE: Statistic: class interval?
Change the bin width on the plot setup screen for your histogram.

Histograms are nearly always uniformly spaced and there are actually very few software packages that allow non-uniform bin widths.

TW

Although I work for HP, the views and opinions I post here are my own.
03-07-2015, 07:43 AM
Post: #5
 parisse Senior Member Posts: 1,311 Joined: Dec 2013
RE: Statistic: class interval?
histogram should do it (inside Geo app), an example from Xcas online help:
histogram([[1.5..1.65,50],[1.65..1.7,20],[1.7..1.8,30]])
03-07-2015, 09:00 AM
Post: #6
 salvomic Senior Member Posts: 1,396 Joined: Jan 2015
RE: Statistic: class interval?
(03-07-2015 06:27 AM)Tim Wessman Wrote:  Change the bin width on the plot setup screen for your histogram.

Histograms are nearly always uniformly spaced and there are actually very few software packages that allow non-uniform bin widths.

(03-07-2015 07:43 AM)parisse Wrote:  histogram should do it (inside Geo app), an example from Xcas online help:
histogram([[1.5..1.65,50],[1.65..1.7,20],[1.7..1.8,30]])

thank you both, I'll make some tries...
I understand that it's not easy to handle this kind of problem.
I thought there was a way to input something like 0..10 or 0::10. This was the sense of my question...
I'll try as you suggest with some examples.
However, for now, I don't find histogram in Geo; I'm searching better...

Salvo

∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib
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