naginterfaces.library.correg.coeffs_zero¶
- naginterfaces.library.correg.coeffs_zero(x)[source]¶
coeffs_zero
computes means and standard deviations of variables, sums of squares and cross-products about zero, and correlation-like coefficients for a set of data.For full information please refer to the NAG Library document for g02bd
https://support.nag.com/numeric/nl/nagdoc_30.2/flhtml/g02/g02bdf.html
- Parameters
- xfloat, array-like, shape
must be set to the value of , the th observation on the th variable, for , for .
- Returns
- xbarfloat, ndarray, shape
contains the mean value, , of the th variable, for .
- stdfloat, ndarray, shape
The standard deviation, , of the th variable, for .
- sspzfloat, ndarray, shape
is the cross-product about zero, , for , for .
- rzfloat, ndarray, shape
is the correlation-like coefficient, , between the th and th variables, for , for .
- Raises
- NagValueError
- (errno )
On entry, .
Constraint: .
- (errno )
On entry, .
Constraint: .
- Notes
No equivalent traditional C interface for this routine exists in the NAG Library.
The input data consists of observations for each of variables, given as an array
where is the th observation on the th variable.
The quantities calculated are:
Means:
Standard deviations:
Sums of squares and cross-products about zero:
Correlation-like coefficients:
If or is zero, is set to zero.