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/usr/share/gretl/data/data7-24.gdt is in gretl-data 2016d-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE gretldata SYSTEM "gretldata.dtd">

<gretldata version="1.3" name="data7-24" frequency="1" startobs="1" endobs="224" type="cross-section">
<description>
DATA7-24
 Data on the sale price and characteristics of homes in the Dove Canyon
 and Coto de Caza areas of Orange County, California, compiled by Jody
 Schimmel.  Dove Canyon is a neighborhod built around a golf course
 with single family tract homes with relatively small lots.  Coto de
 Caza is a more upscale area.  It is more rural with large custom
 homes, some with horse corrals.

    salepric = sale price in thousands of dollars
    sqft     = living area in square feet
    bedrms   = number of bed rooms
    baths    = number of baths
    garage   = number of car spaces
    age      = age of house in years
    city     = 1 for Coto de Caza and 0 for Dove Canyon
</description>
<variables count="7">
<variable name="salepric"
 label="sale price in thousands of dollars"
/>
<variable name="sqft"
 label="living area in square feet"
/>
<variable name="bedrms"
 label="number of bedrooms"
 discrete="true"
/>
<variable name="baths"
 label="number of baths"
/>
<variable name="garage"
 label="number of car spaces"
 discrete="true"
/>
<variable name="age"
 label="age of house in years"
/>
<variable name="city"
 label="1 for Coto de Caza and 0 for Dove Canyon"
 discrete="true"
/>
</variables>
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</gretldata>