Enum datafusion_physical_expr::expressions::RegrType

pub enum RegrType {
    Slope,
    Intercept,
    Count,
    R2,
    AvgX,
    AvgY,
    SXX,
    SYY,
    SXY,
}

Variants

Slope

Variant for regr_slope aggregate expression Returns the slope of the linear regression line for non-null pairs in aggregate columns. Given input column Y and X: regr_slope(Y, X) returns the slope (k in Y = k*X + b) using minimal RSS (Residual Sum of Squares) fitting.

Intercept

Variant for regr_intercept aggregate expression Returns the intercept of the linear regression line for non-null pairs in aggregate columns. Given input column Y and X: regr_intercept(Y, X) returns the intercept (b in Y = k*X + b) using minimal RSS fitting.

Count

Variant for regr_count aggregate expression Returns the number of input rows for which both expressions are not null. Given input column Y and X: regr_count(Y, X) returns the count of non-null pairs.

R2

Variant for regr_r2 aggregate expression Returns the coefficient of determination (R-squared value) of the linear regression line for non-null pairs in aggregate columns. The R-squared value represents the proportion of variance in Y that is predictable from X.

AvgX

Variant for regr_avgx aggregate expression Returns the average of the independent variable for non-null pairs in aggregate columns. Given input column X: regr_avgx(Y, X) returns the average of X values.

AvgY

Variant for regr_avgy aggregate expression Returns the average of the dependent variable for non-null pairs in aggregate columns. Given input column Y: regr_avgy(Y, X) returns the average of Y values.

SXX

Variant for regr_sxx aggregate expression Returns the sum of squares of the independent variable for non-null pairs in aggregate columns. Given input column X: regr_sxx(Y, X) returns the sum of squares of deviations of X from its mean.

SYY

Variant for regr_syy aggregate expression Returns the sum of squares of the dependent variable for non-null pairs in aggregate columns. Given input column Y: regr_syy(Y, X) returns the sum of squares of deviations of Y from its mean.

SXY

Variant for regr_sxy aggregate expression Returns the sum of products of pairs of numbers for non-null pairs in aggregate columns. Given input column Y and X: regr_sxy(Y, X) returns the sum of products of the deviations of Y and X from their respective means.

Trait Implementations

impl Clone for RegrType

fn clone(&self) -> RegrType

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RegrType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.