Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: highly skewed, highly zeroed data


From   "Jason Ferris" <[email protected]>
To   <[email protected]>
Subject   st: highly skewed, highly zeroed data
Date   Wed, 25 Nov 2009 13:07:28 +1100

Hi, 
I have tried to find my answer in the statalist repository but nothing
has quite hit the mark.

I would like to calculate a mean and 95% CI of this data - which is
highly skewed and the majority are zeros.

I am aware of adding a constant and the transforming on the log scale
(with antilog) for interpretation.  However after adding a constant to
overcome the zero issue and then transforming on the log scale I am
still left with a highly skewed distribution.  Which gets me no close to
a mean and CI.

PS. As this is survey data I would be most keen for the 'right' answer
to be addressed in svy: terms

Jason

 time (hrs) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        518       80.06       80.06
        .25 |          2        0.31       80.37
         .5 |          3        0.46       80.83
          1 |         15        2.32       83.15
        1.5 |          1        0.15       83.31
          2 |         23        3.55       86.86
          3 |         10        1.55       88.41
        3.5 |          1        0.15       88.56
          4 |         11        1.70       90.26
          5 |         13        2.01       92.27
          6 |          9        1.39       93.66
          7 |          3        0.46       94.13
          8 |         19        2.94       97.06
         20 |         10        1.55       98.61
         45 |          9        1.39      100.00
------------+-----------------------------------

------------------------------------------
DISCLAIMER: This message (including any attachments) is intended solely for the addressee(s) named and may contain confidential or privileged information. 
If you are not the intended recipient, please delete it and notify the sender. 
Views expressed in this message are those of the individual sender,and are not necessarily the views of the Turning Point Alcohol and Drug Centre (ABN: 68 223 819 017).  

<a href="http://www.turningpoint.org.au";>Turning Point Alcohol and Drug Centre</a>

Although this message and any attachments have been scanned for viruses by 'Trend Micro InterScan' at the time of sending, you are advised to rescan on receipt.

The whole or parts of this email may be subject to copyright of Turning Point Alcohol and Drug Centre (ABN: 68 223 819 017), and/or third parties. 
You can only re-transmit, distribute or use the material if you are authorised to do so.

Please consider the environment before printing this email or attachments.

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index