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st: Merge by range of values

From   "Jeremy A. Grey" <>
Subject   st: Merge by range of values
Date   Mon, 13 Jun 2011 16:49:42 -0500

Hi everyone,

I am trying to find a way to merge data sets according to a range of
values, sort of a combination of m:1 merge and inrange().

In one data set, each observation represents a subject with the
individual's value for variable X.

In another data set, each observation represents a range of values for
variable X.  The start and end values of the range are separate
variables, such as start_X and end_X.  The remaining variables contain
the values of Y and Z for all values of X within that range.

Is there a way to merge the Y and Z data from the second data set into
the first by comparing the value of X to the range specified by
start_X and end_X?

I thought of transforming the second data set in order to create new
variables, such as start_X_1, end_X_1, Y_1, Z_1, start_X_2, end_X_2,
Y_2, Z_2, etc., adding those data to each observation in the first
dataset, and using a loop and inrange() in order to compute Y and Z
for each subject, but there are about 3,000,000 different ranges of X
in the second data set, so this is impractical.

Thank you in advance for your help.


Jeremy A. Grey, MA

Doctoral Student
Division of Epidemiology and Community Health
University of Minnesota School of Public Health
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