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<p> </p> <div align="center"> <table style="background-color: #ffffcc; background-image: none; color: #003300; border: 4px solid #003300; float: none; text-align: left; vertical-align: top; width: 400px;" border="4" frame="void" rules="none"> <tbody> <tr align="center"> <td style="background-color: #003300; background-image: url('http://lcmates.eu/none'); color: #e1e1cc; text-align: center; vertical-align: middle; border-style: none; width: 100%;" valign="top"><span style="font-size: large; color: #ffff99;">Covariància</span></td> </tr> <tr> <td valign="top" width="NaNpx"> <div align="justify"><span style="color: #003300;"><strong><span style="font-size: small;">La covariància és la mitjana dels productes de les desviacions de X<sub>i</sub> i de Y<sub>i</sub> respecte a les seves mitjanes. Es calcula amb:</span></strong></span></div> <div align="center"><span class="nolink">«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub mathcolor=¨#003300¨»«mi mathvariant=¨bold¨ mathcolor=¨#003300¨»§#963;«/mi»«mi mathvariant=¨bold¨»XY«/mi»«/msub»«mo mathcolor=¨#003300¨»§#160;«/mo»«mo mathcolor=¨#003300¨»=«/mo»«mo mathcolor=¨#003300¨»§#160;«/mo»«munderover mathcolor=¨#003300¨»«mo»§#8721;«/mo»«mrow»«mi mathvariant=¨bold¨»i«/mi»«mo»=«/mo»«mn»1«/mn»«/mrow»«mi mathvariant=¨bold¨»n«/mi»«/munderover»«mfenced mathcolor=¨#003300¨»«mrow»«mover»«mi mathvariant=¨bold¨»X«/mi»«mo»§#175;«/mo»«/mover»«mo»-«/mo»«msub»«mi mathvariant=¨bold¨»X«/mi»«mi mathvariant=¨bold¨»i«/mi»«/msub»«/mrow»«/mfenced»«mo mathcolor=¨#003300¨»§#183;«/mo»«mfenced mathcolor=¨#003300¨»«mrow»«mover»«mi mathvariant=¨bold¨»Y«/mi»«mo»§#175;«/mo»«/mover»«mo»-«/mo»«msub»«mi mathvariant=¨bold¨»Y«/mi»«mi mathvariant=¨bold¨»i«/mi»«/msub»«/mrow»«/mfenced»«mo mathcolor=¨#003300¨»§#183;«/mo»«msub mathcolor=¨#003300¨»«mi mathvariant=¨bold¨ mathcolor=¨#003300¨»f«/mi»«mi mathvariant=¨bold¨»i«/mi»«/msub»«/math»</span></div> </td> </tr> </tbody> </table> </div>
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Thursday, 23 August 2018, 11:09 AM
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