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<p class="MsoNormal"><span style="color:#1F497D">Hi Jennifer,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I want to know how to add a best fit line and equation (including the slope value) to a scatter plot in GrADs. I have attached an example that should explain what I want to do.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Emily<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> gradsusr <gradsusr-bounces@gradsusr.org> <b>On Behalf Of
</b>Adams, Jennifer M. (GSFC-610.2)[ADNET SYSTEMS INC]<br>
<b>Sent:</b> Tuesday, October 08, 2019 2:32 PM<br>
<b>To:</b> GrADS Users Forum <gradsusr@gradsusr.org><br>
<b>Subject:</b> Re: [gradsusr] [non-nasa source] [EXTERNAL] Add regression line to scatter plot</p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi, Emily – </p>
<p class="MsoNormal">What exactly is your question?</p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">-- <span style="color:black"><br>
Jennifer Miletta Adams<br>
ADNET Systems, Inc.<br>
NASA/GSFC, Code 610.2</span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Building 32, Room S159<br>
(301) 614-6070<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">gradsusr <<a href="mailto:gradsusr-bounces@gradsusr.org">gradsusr-bounces@gradsusr.org</a>> on behalf of "Saunders, Emily (GSFC-610.1)[SCIENCE
SYSTEMS AND APPLICATIONS INC]" <<a href="mailto:emily.saunders@nasa.gov">emily.saunders@nasa.gov</a>><br>
<b>Reply-To: </b>GrADS Users Forum <<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>><br>
<b>Date: </b>Tuesday, October 1, 2019 at 9:59 AM<br>
<b>To: </b>"<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>" <<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>><br>
<b>Subject: </b>[non-nasa source] [EXTERNAL] [gradsusr] Add regression line to scatter plot<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello all,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I have a question about adding a linear regression line to a scatter plot using the ‘sregr’ command. Here is a sample of the script I created:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">'set lat 54 60'</p>
<p class="MsoNormal">'set lon -120 -110'</p>
<p class="MsoNormal">*'define a=o3*1e9'</p>
<p class="MsoNormal">'define a = ave(o3*1.0e9, time='d_start''timestring', time='d_end''timestring')'</p>
<p class="MsoNormal">say 'define a = ave(o3*1.0e9, time='d_start''timestring', time='d_end''timestring')'</p>
<p class="MsoNormal">'set vrange 0 60'</p>
<p class="MsoNormal">*'define b=pm25_rh35_gcc'</p>
<p class="MsoNormal">'define b = ave(pm25_rh35_gcc, time='d_start''timestring', time='d_end''timestring')'</p>
<p class="MsoNormal">say 'define b = ave(pm25_rh35_gcc, time='d_start''timestring', time='d_end''timestring')'</p>
<p class="MsoNormal">'set vrange 0 1200'</p>
<p class="MsoNormal">'set gxout scatter'</p>
<p class="MsoNormal">'set cmark 2'</p>
<p class="MsoNormal">'set cthick 12'</p>
<p class="MsoNormal">'set ccolor 9'</p>
<p class="MsoNormal"> titlepm25gcc = 'Surface_O3_and_PM25_Scatter_plot'</p>
<p class="MsoNormal"> diagnostic = 'Surface'</p>
<p class="MsoNormal"> location = 'Alberta'</p>
<p class="MsoNormal"> type = 'Scatter'</p>
<p class="MsoNormal"> imagenamepm25gcc = diagnostic'.'location'.NRT.'fieldnamepm25gcc'.scatter_plot.('d_start':'d_end').'MM'.'DD'.'YYYY'.png'</p>
<p class="MsoNormal">'d b;a'</p>
<p class="MsoNormal">*'set time 'timestring</p>
<p class="MsoNormal">*'set lat 54 60'</p>
<p class="MsoNormal">*'set lon -120 -110'</p>
<p class="MsoNormal">*'set gxout line'</p>
<p class="MsoNormal">*'set z 1'</p>
<p class="MsoNormal">*'set t 1'</p>
<p class="MsoNormal">*'set cmark 0'</p>
<p class="MsoNormal">*'set cthick 12'</p>
<p class="MsoNormal">*'set ccolor 0'</p>
<p class="MsoNormal">*'set cstyle 0'</p>
<p class="MsoNormal">*'set line 1 1 5'</p>
<p class="MsoNormal">*'d sregr(b, a, lon=-120, lon=-110, lat=54, lat=60)'</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks for your help in advanced.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size:12.0pt">Emily Saunders, PhD.</span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Senior Research Scientist</span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Global Modeling and Assimilation Office/SSAI</span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">NASA Goddard Space Flight Center Bldg 33, Room B-227B</span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Code 610.1, Greenbelt, MD, 20771</span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Phone: +1-301-614-6532</span></p>
<p class="MsoNormal"> </p>
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