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How to use calc_measurement_error method in yandex-tank

Best Python code snippet using yandex-tank

cumulative_criterions.py

Source:cumulative_criterions.py

...423        self.last = matched_responses424        if len(self.tangents) > self.seconds_limit:425            self.tangents.popleft()426            self.second_window.popleft()427        self.measurement_error = self.calc_measurement_error(self.tangents)428        self.total_tan = float(sum(self.tangents) / len(self.tangents))429        logger.debug(430            "Last trend for http codes %s: %.2f +/- %.2f", self.codes_mask,431            self.total_tan, self.measurement_error)432        if self.total_tan + self.measurement_error < 0:433            self.cause_second = self.second_window[0]434            logger.debug(self.explain())435            return True436        return False437    def calc_measurement_error(self, tangents):438        '''439        formula for measurement error440        sqrt ( (sum(1, n, (k_i - <k>)**2) / (n*(n-1)))441        '''442        if len(tangents) < 2:443            return 0.0444        avg_tan = float(sum(tangents) / len(tangents))445        numerator = float()446        for i in tangents:447            numerator += (i - avg_tan) * (i - avg_tan)448        return math.sqrt(numerator / len(tangents) / (len(tangents) - 1))449    def get_rc(self):450        return 30451    def explain(self):...

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