g/1998/Math/MathML"><semantics><mtable><mtr><mtd columnalign="right" style="text-align: right; padding-right: 0"><msub><mi>y</mi><mrow><mi>k</mi><mo>,</mo><mi>.</mi></mrow></msub></mtd><mtd columnalign="left" style="text-align: left; padding-left: 0"><mo>∼</mo><mtext mathvariant="normal">MN</mtext><mo stretchy="false" form="prefix">(</mo><mi>μ</mi><mo>,</mo><mtext mathvariant="normal">S</mtext><mo stretchy="false" form="postfix">)</mo><mo>,</mo></mtd></mtr><mtr><mtd columnalign="right" style="text-align: