What can we say about QQPlot of this data ?

  • #1
This is the QQPlot of a data. What can be inferred from this plot ?
(Tested against Normal Distribution)
QQPLOT 1 :
attachment.php?attachmentid=51211&stc=1&d=1348650222.png


QQPLOT 2:
attachment.php?attachmentid=51212&stc=1&d=1348650379.png
 

Attachments

  • qq1.png
    qq1.png
    4.7 KB · Views: 397
  • qq2.png
    qq2.png
    4 KB · Views: 430

Answers and Replies

  • #2
315
1
The first one is not normal - there is more data on the tails than there would be in a normal distribution.

The second one looks approximately normal, except for the fact that it is discrete instead of continuous.
 
  • #3
thnks mxscnt

Jaque-Bera tests failed for first dataset.
while for data sets similar to second one, few were passing JB test for normality.

these are the p-values for JB test for 14 data sets similar to second graph.

P-VALUE
0.005
0.039
0.003
0
0.00287214
0.595792
0.190489
0.0947931
0.782434
0
0.12
0.257
0.656
0.246

you can see almost 3 sets qualify for normality.

Though there QQPlot are almost similar.

What can be the reason for difference ???
 

Related Threads on What can we say about QQPlot of this data ?

  • Last Post
Replies
1
Views
1K
Replies
3
Views
671
Replies
1
Views
1K
  • Last Post
Replies
1
Views
1K
Replies
1
Views
189
Replies
2
Views
3K
Replies
6
Views
1K
  • Last Post
Replies
15
Views
90K
Top