<p style="font-family:helvetica, arial, 'sans serif';margin-left:63.046875px;margin-right:63.046875px;font-size:medium;line-height:normal;"><br></p> <p style="font-family:helvetica, arial, 'sans serif';margin-left:63.046875px;margin-right:63.046875px;font-size:medium;line-height:normal;">The <a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#sd_line" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank">SD line</a> goes through the <a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#point_of_averages" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank">point of averages</a>, and has slope equal to SD<sub>Y</sub><em>/</em>SD<sub>X</sub> if the <a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#correlation_coef" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank">correlation coefficient <em>r</em></a> is greater than or equal to zero. The SD line has slope −SD<sub>Y</sub><em>/</em>SD<sub>X</sub> if <em>r</em> is negative. That is, the <a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#sd_line" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank">SD line</a> climbs (sinks, if <em>r</em> is negative) by SD<sub>Y</sub> when you move to the right by SD<sub>X</sub>. The sign of the slope of the<a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#sd_line" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank">SD line</a> is the same as the sign of <a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#correlation_coef" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank"><em>r</em></a>, and the size of the slope of the SD line is SD<sub>Y</sub><em>/</em>SD<sub>X</sub>. In <a class="glossRef" href="http://www.stat.berkeley.edu/~stark/SticiGui/Text/gloss.htm#standard_units" style="color:#107080;text-decoration:none;font-variant:small-caps;font-weight:bold;font-size:17px;" target="_blank">standard units</a>, the slope of the SD line is one if <em>r</em> is greater than or equal to zero, and equal to minus one if <em>r</em> is negative. If SD<sub>X</sub> is zero, the SD line is not defined</p> <p style="font-family:helvetica, arial, 'sans serif';margin-left:63.046875px;margin-right:63.046875px;font-size:medium;line-height:normal;"><br></p> <p style="font-family:helvetica, arial, 'sans serif';margin-left:63.046875px;margin-right:63.046875px;font-size:medium;line-height:normal;">SD line : 표준편차선</p> <p style="font-family:helvetica, arial, 'sans serif';margin-left:63.046875px;margin-right:63.046875px;font-size:medium;line-height:normal;">correlation coefficient r = 상관계수 r</p> <p style="font-family:helvetica, arial, 'sans serif';margin-left:63.046875px;margin-right:63.046875px;font-size:medium;line-height:normal;">입니다. that is 부터 무슨말인지 멘붕중이에요ㅠㅠ</p>
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