def to_json(self):
        self.check_valid()
        return self._mangle(self._content)
cumulative distribution function
dataset/ETHPy150Open moloney/dcmstack/src/dcmstack/dcmmeta.py/DcmMetaExtension.to_json--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/sandbox/distributions/mv_normal.py/MVNormal.cdf