Function dfq_stddev 

pub fn dfq_stddev() -> Arc<CalculationRule>

Creates a rule that calculates the standard deviation of a column.

Examples

use datafusion_quality::rules::table::dfq_stddev;
use datafusion_quality::RuleSet;

// Create a rule to calculate the standard deviation of the age column
let rule = dfq_stddev();
let mut ruleset = RuleSet::new();
ruleset.with_table_rule("age", rule, None);