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Re: st: How to deal with the accruacy of storage type?


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to deal with the accruacy of storage type?
Date   Mon, 28 Sep 2009 14:35:06 -0400


 count if abs(x-y)<0.0001

where 0.0001 indicates the precision.

hth,
Jeph

gjhxmu@sina.com wrote:
I encountered a problem on the accuracy of storage type.
For example, I typed the following in the stata,


clear
input       x y
    .46520616   .4652062
    .02347426   .0234743
    .01774185   .0177418
    .04014428   .0401443
    .24818808   .2481881
    .41385191   .4138519
    .27035237   .2703524
    .03764375   .0376438
    .22899382   .2289938
    .08620364   .0862036
end
l
count if x==y


The result of "count if x==y" is 0. However, in my actual matter, this situation should be treated as equal between x and y if the # digits (such as four or five) after decimal are the same.
What is the right command to express the above meaning?

Thank you a lot for any help.


Best regards,

Rose.

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