Manuals/calci/MCORREL

MCORREL (ArrayOfArrays)

• $ArrayOfArrays$ is set of values.

Description

• This function is showing the result for multiple correlation.
• In $MCORREL(ArrayOfArrays)$,$Arrayofarrays$ are set of values.
• Correlation is a statistical technique which shows the relation of strongly paired variables.When one variable is related to a number of other variables, the correlation is not simple.
• It is multiple if there is one variable on one side and a set of variables on the other side.
• If we have a series of $n$ measurements of $X$ and $Y$ written as $x_{i}$ and $y_{i}$ where $i=1,2,...n$ then the Sample Correlation Coefficient is:

$CORREL(X,Y)=r_{xy}={\frac {\sum _{i=1}^{n}(x_{i}-{\bar {x}})(y_{i}-{\bar {y}})}{\sqrt {\sum _{i=1}^{n}(x_{i}-{\bar {x}})^{2}\sum _{i=1}^{n}(y_{i}-{\bar {y}})^{2}}}}$

• ${\bar {x}}$ and ${\bar {y}}$ are the sample means of $X$ and $Y$.
• The above formula is used for simple correlation.
• Now consider the variables x,y and z we define the multiple correlation as:

$R_{zxy}={\sqrt {\frac {r_{xz}^{2}+r_{yz}^{2}-2r_{xz}r_{yz}r_{xy}}{1-r_{xy}^{2}}}}$

• $r_{xy}$ is the correlation of x and y.
• $r_{yz}$ is the correlation of y and z.
• $r_{zx}$ is the correlation of z and x.
• Here x and y are viewed as the independent variables and z is the dependent variable.
• This function will give the result as error when

1.$ArrayofArrays$ are non-numeric or different number of data points.
2.$ArrayofArrays$is empty
3.The denominator value is zero.

Examples

1. MCORREL([[10,12,14],[19,43,18],[20,35,90]])

1	-0.035325913054179946	0.9496528264568825
-0.035325913054179946	1	-0.3466559828504114
0.9496528264568825	-0.3466559828504114	1

2. MCORREL([[10,19,18],[-24,90.3,25]])

1	0.8755550584018907
0.8755550584018907	1

Related Videos

Types of a Matrix

See Also

• CORREL
• MINVERSE
• MMULT

References

• Multiple Correl

• List of Main Z Functions

• Z3 home