<div dir="ltr"><div><div><span style="color:rgb(255,0,0)">Dear All <br><br></span></div><span style="color:rgb(255,0,0)">Kindly your help on errors with SPI using Pearson Type 3 described below<br><br></span></div><span style="color:rgb(255,0,0)">Dawit</span><br><div><div><div><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Dawit Abebe</b> <span dir="ltr"><<a href="mailto:dawit.kan@gmail.com" target="_blank">dawit.kan@gmail.com</a>></span><br>Date: 8 June 2017 at 15:43<br>Subject: SPI values derived using Pearson 3<br>To: <a href="mailto:ncl-talk-request@ucar.edu" target="_blank">ncl-talk-request@ucar.edu</a>, <a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a>, Mary Haley <<a href="mailto:haley@ucar.edu" target="_blank">haley@ucar.edu</a>><br><br><br><div dir="ltr"><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)">Dear All,<br><br></span></font></span><div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)">Can any one help me understand the following error messages when calculating SPI based on Pearson 3
option. <br></span></font></span><br><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>Part of my script related to this is:<br>==============================<wbr>===============<br></span></span></font></span><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>opt = True<br></span></span></font></span><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>opt@spi_type = 3<br></span></span></font></span><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>spi = new((/nrun, ntime, nlat, mlon/), typeof(prc), pmsg)<br><br></span></span></font></span><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>do nr=0, nrun-1<br></span></span></font></span><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span> spi(nr, :, :, :) = dim_spi_n(prc, run(r), opt, 0)<br></span></span></font></span><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>end do<br><br></span></span></font></span></span></font></span></div><div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>However, <br></span></span></font></span></span></font></span></div><div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)">1. I get the an error message: <span style="color:rgb(255,0,0)">"</span><span><span style="color:rgb(255,0,0)">*** ERROR *** ROUTINE CDFPE3 : PARAMETERS INVALID”</span> , why and what does this mean? I cam across a similar problem being reported but not responded to. <br><br></span></span></font></span></div><div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>2.
After the above error message, however, NCL has generated the SPI values. However, for months with consecutive zero precipitation values, the corresponding SPI value is indicated as missing value (i.e. -999). The fact that Pearson 3 is advantageous over Gama that </span><span>where monthly and seasonal precipitation of zero is common,
it will give better results than Gama (<a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_spi_n.shtml" target="_blank">http://www.ncl.ucar.edu/Docum<wbr>ent/Functions/Built-in/dim_<wbr>spi_n.shtml</a>), I'm unsure why missing values (-999) generated for months and seasons with zero precipitation value. This is observed mainly on SPI calculate over 1 and 3 months time scale.<br><br></span></span></font></span></div><div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span>I would very much appreciate if any me help me to understand and solve this two issues. <br></span></span></font></span></div><span class="gmail-m_-4915457008815115858HOEnZb"><font color="#888888"><div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)"><span><br></span></span></font></span></div><span style="font-family:comic sans ms,sans-serif"><font size="2"><span style="color:rgb(0,0,255)">Dawit</span></font></span><br></font></span></div>
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