Hello.
Me too i was playing 3 days ago and i went up to this code
The output is correct, but i dont know is there is a sorter version. have a fun and i hope it helps.
Panos
EnableTextOutput( 0 );
X = MxFromString( "{{88.5,94.7,84.3,90.1,89,89.8,91.6,90.3,90,91.5,89.9,98.8,88.3,90.4,91.2,90.6,92.2,87.7,91.1,86.7,93.4,96.1,89.6,90.4,91.6,90.7,88.6,88.3,94.2}}" );
printf( MxToString( X ) );
col = MxGetSize( x, 1 );
sumX = sXsq= 0;
for( i = 0; i < col; i++ ) {
sumX += x[ 0 ][i ]; // sum of Row Χ
// variance Of X
sXsq += x[ 0 ][i ] ^2 ; // sum of square Χ
// printf( "\n sXsq X =\t" + sXsq );
}
MeanX=sumX/col;
VarianceOfX = (sXsq/col)-MeanX^2;
// Standard Deviation is a measure of how spread out numbers are
StandardDeviation = sqrt(varianceOfX); // Population Standard Deviation= The formula is the square root of the Variance
SampleVariance = sqrt(sumX/col-1); // Sample Standard Deviation= divide by N-1 when calculating Sample Variance
printf( "\n Sum X= \t%g", sumX );
printf( "\n Mean Of X = \t%g", MeanX );
printf( "\n sum of square = %g", sXsq );
printf( "\n Variance Of X = \t%g", varianceOfX );
printf( "\n Standard Deviation \t"+ StandardDeviation );
printf( "\n Sample Data \t"+ SampleVariance );
Panos
On 09-07-16 9:44 PM, 'TA' tagroups@sbcglobal.net [amibroker] wrote:
Does anybody know how to calculate Standard deviation of matrix elements in AB? TIA
Posted by: Panos Boufardeas <panosbouf@gmail.com>
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