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Math Help - Combine the datas and find outliers or do not combine the datas.. HELP

  1. #1
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    Smile Combine the datas and find outliers or do not combine the datas.. HELP

    I compared the stock returns between Australia and US over the period of 1991 and 1998
    I found the summary measures(eg/min,max,Q1,Q2,Q3,coneficient of variation, stdv ect...)
    I found the ourtlier for australian data and Us data seperately. There were few outliers for Australian and one outlier for US.
    The question was If someone say"why dont we combine the two sets and then determine the outlier" and Ohter says" I'am not sure, I think it is not a good idea to combine"
    Briefly write how you I response for these comments....
    I have no idea whether i should combine the datas or not and i need a reason as well
    Thank you for helping me =)
    Last edited by sinni1131; April 1st 2009 at 07:07 AM.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by sinni1131 View Post
    I compared the stock returns between Australia and US over the period of 1991 and 1998
    I found the summary measures(eg/min,max,Q1,Q2,Q3,coneficient of variation, stdv ect...)
    I found the ourtlier for australian data and Us data seperately. There were few outliers for Australian and one outlier for US.
    The question was If someone say"why dont we combine the two sets and then determine the outlier" and Ohter says" I'am not sure, I think it is not a good idea to combine"
    Briefly write how you I response for these comments....
    I have no idea whether i should combine the datas or not and i need a reason as well
    Thank you for helping me =)
    The usual approach is try it and see if you like the result. (if there is any evidence that the distributions are not the same with seperate outliers removed then you should probably not contemplate combining them anyway).

    CB
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