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<title> Quadratic Spline Fit to Empirical nfx Data </title>
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<font style="font-weight: bold;">Quadratic Spline Fertility Schedules</font><br>
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This program performs unweighted least squares fits to nfx data, using Quadratic
Spline fertility schedules as described in
<a href="http://www.demographic-research.org/Volumes/Vol9/5/" target="paper">Schmertmann [2003]</a>
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<a href="qsfit_documentation.html" target="instruct" style="color: rgb(51, 51, 255);">
<font style="font-weight: bold;" size="-1"> Instructions</font>
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<b>Data and Parameters</b>
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<font size="-1"><b>Type or paste (x,f) data here:</b></font> <br>
<textarea name="data" rows="7" cols="22"></textarea> <br>
<input type="button" value="Example1" onclick="LoadExampleData(this.form,5)">
<input type="button" value="Example2" onclick="LoadExampleData(this.form,1)">
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<font size="-1"><b> Actions:</b></font> <br>
<input type="button" value="1. Set Data " onclick="SetupData(this.form)"><br>
<input type="button" value="2. Fit Model" onclick="QSFit(this.form)"><br>
<input type="button" value="Reset" onclick="RestoreDefault(this.form)">
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<font size="-1"><b> Parameters:</b></font><br>
R
<input type="text" name="R_text" size="6" value=".200"> <br>
α
<input type="text" name="alpha_text" size="6" value="14"><br>
P
<input type="text" name="P_text" size="6" value="23"><br>
H
<input type="text" name="H_text" size="6" value="33">
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<b>Select Report Type</b>
<select name="ReportType" onchange="ShowReport(this.form,this.form.ReportType.value)">
<option value="Data"> Input Data</option>
<option value="Iter"> Parameter Estimation</option>
<option value="FitN"> Observed and Predicted nfx values</option>
<option value="Fit1"> Fitted 1fx and f(x) values</option>
</select>
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<textarea name="report" rows="28" cols="55"></textarea>
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<applet code="xymeter.class" name="plotapp" width="450" height="250">
<param name="header" value="Quadratic Spline Fit">
<param name="xtitle" value="age">
<param name="xfrom" value="10">
<param name="xto" value="50">
<param name="yfrom" value="0">
<param name="yto" value="0.35">
<param name="abgcol" value="white">
<param name="maxlin" value="2">
<param name="lincol" value="blue,red">
<param name="xypairs" value="400">
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