<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear NCL-Talk participant<div class=""><br class=""></div><div class="">I am trying to assess the performance of the gamma and Pearson3 distribution in specific climatic region. The SPI value from Pearson3 returned two things I am not confident about and need your comment. These are</div><div class="">1. A long list of error message:</div><div class=""><p style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> *** ERROR *** ROUTINE SAMLMR : PARAMETER NMOM INVALID</span></p>
<p style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> *** ERROR *** ROUTINE CDFPE3 : PARAMETERS INVALID</span></p>
<p style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> *** ERROR *** ROUTINE CDFPE3 : PARAMETERS INVALID</span></p>
<p style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""> *** ERROR *** ROUTINE CDFPE3 : PARAMETERS INVALID</span></p><div class=""><br class=""></div></div><div class="">2. Pearson3 returns an SPI missing value(-999) for SPI-monthly and SPI-3 where monthly precipitation values are zero for SPI-monthly and three consecutive months for SPI-3. </div><div class=""><br class=""></div><div class="">I kindly seek your view explaining these observations. </div><div class=""><br class=""></div><div class="">Thank you so much</div><div class=""><br class=""></div><div class="">Dawit </div><div class="">.</div><div class=""><br class=""></div></body></html>