LinRegIntercept (PEL)
This function calculates the linear regression of a set and returns the value of the x-intercept in the regression line y = ax + b.
LinRegIntercept(
Scope_Expression,
Numeric_Expression_y
[ , Numeric_Expression_x ]
)
Parameters
- Scope_Expression
A valid PerformancePoint Expression Language (PEL) expression that returns a set.
- Numeric_Expression_y
A valid numeric expression that is typically a PEL expression of cell coordinates that return a number that represents values for the y-axis.
- Numeric_Expression_x
A valid numeric expression that is typically a PEL expression of cell coordinates that return a number that represents values for the x-axis.
Return Value
After obtaining the set of points, the LinRegIntercept function returns the intercept of the regression line (b in the equation y = ax + b).
Remarks
Linear regression uses the least-squares method to calculate the equation of a regression line (that is, the best-fit line for a series of points). The regression line has the following equation, where a is the slope and b is the intercept:
y = ax + b
The LinRegIntercept function evaluates the specified set against the first numeric expression, Numeric_Expression_y,**to obtain the values for the y-axis. The function then evaluates the specified set against the second numeric expression, Numeric_Expression_x, if specified, to obtain the values for the x-axis.
If Numeric_Expression_x is not specified, the function uses the current context of the cells in the specified set as values for the x-axis. Not specifying the x-axis argument is frequently used with the Time dimension.
To determine the slope of the regression line y = ax+b, use LinRegSlope (PEL).
The PEL compiler cannot generate SQL code for this function.