driver-core/src/main/com/mongodb/client/model/Accumulators.java
public static <TExpression> BsonField stdDevSamp(final String fieldName, final TExpression expression) {
        return accumulator("$stdDevSamp", fieldName, expression);
    }
public static <TExpression> BsonField stdDevSamp(final String fieldName, final TExpression expression) {
        return accumulator("$stdDevSamp", fieldName, expression);
    }
Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression
when applied to all members of the group.

<p>Use if the values encompass a sample of a population of data from which to generalize about the population.</p>

@param fieldName the field name
@param expression the expression
@param <TExpression> the expression type
@return the field
@mongodb.driver.manual reference/operator/aggregation/stdDevSamp/ $stdDevSamp
@mongodb.server.release 3.2
@since 3.2