<div dir="ltr"><div><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/ttest.shtml"><b>http://www.ncl.ucar.edu/Document/Functions/Built-in/ttest.shtml</b></a></div><div><em><br></em></div><div>The documentation <em>answers your question:</em></div><div><em><br></em></div><div><em>iflag</em></div>
<p class="gmail-indent">Set to False if the two original samples are assumed to have the
same population variance. Set to True if the two original samples are
assumed to have different population variances. <b>The latter
applies the Welsh degree-of-freedom modification (Welsh's t-test).
</b></p></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 29, 2021 at 6:45 AM Chathurika via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<p>
<span style="font-size:16px;font-family:Georgia">Dear all,</span>
</p>
<p>
<br>
</p>
<p>
<span style="font-size:16px;font-family:Georgia">If I use 'ttest' with '</span><em style="margin:0px;padding:0px;font-family:verdana,sans-serif;font-size:13.3333px;white-space:normal;background-color:rgb(255,255,255)"><span style="font-size:16px;font-family:Georgia">iflag=True',</span></em>
</p>
<p>
<span style="font-size:16px;font-family:Georgia"> Does this run the </span><span style="color:rgb(51,51,51);font-family:Georgia;font-size:16px;white-space:normal;background-color:rgb(255,255,255)">Welsh's t-test ?</span>
</p>
<p>
<br>
</p>
<p>
<span style="font-family:Georgia;font-size:16px">Thank you so much and best regards,</span>
</p>
<p>
<span style="font-family:Georgia;font-size:16px">Chathu</span>
</p>
<br>
<span>
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<blockquote style="margin:0px 0px 0px 40px;padding:0px;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-variant-ligatures:normal;border:medium none">
<span style="font-style:italic"><span style="font-size:x-small">Wickramage Chathurika Hemamali</span></span>
<div>
<span style="font-style:italic"><span style="font-size:x-small">Msc in Physical Oceanography</span></span>
</div>
<div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2251">
<span style="font-style:italic"><span style="font-size:x-small">State Key Laboratory of Tropical Oceanography</span></span>
</div>
</div>
<div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2252">
<span style="font-style:italic"><span style="font-size:x-small">South China Sea Institute of Oceanology</span></span>
</div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2252">
<span style="font-style:italic"><span style="font-size:x-small">University of Chinese Academy of Science</span></span>
</div>
</div>
<div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264">
<span style="font-style:italic"><span style="font-size:x-small">China</span></span>
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<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<span style="font-style:italic;font-size:medium"><br>
</span>
</div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<i><span style="font-size:xx-small">Specialized in Oceanography and Marine Geology (Bachelor)</span></i>
</div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<i><span style="font-size:xx-small">University of Ruhuna</span></i>
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<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<i><span style="font-size:xx-small">Matara</span></i>
</div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<i><span style="font-size:xx-small">Sri Lanka</span></i>
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<span style="font-style:italic;font-size:medium"><br>
</span>
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<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<span style="font-style:italic;font-size:medium">Email : <a>wickramagechathurika@rocketmail.com</a></span>
</div>
<div id="gmail-m_5319742966302681733ydpc6aa4ef1yui_3_16_0_ym19_1_1496286059659_2264" style="font-size:small">
<span style="font-style:italic;font-size:medium"><a>chatu@scsio.ac.cn</a></span>
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