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---
title: ExpvalMeasMitigatorFitter
description: API reference for qiskit.ignis.mitigation.ExpvalMeasMitigatorFitter
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.ignis.mitigation.ExpvalMeasMitigatorFitter
---
# ExpvalMeasMitigatorFitter
<Class id="qiskit.ignis.mitigation.ExpvalMeasMitigatorFitter" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.7/qiskit/ignis/mitigation/expval/fitter.py" signature="ExpvalMeasMitigatorFitter(result, metadata)" modifiers="class">
Bases: `object`
Expectation value measurement error mitigator calibration fitter.
See [`qiskit.ignis.mitigation.expval_meas_mitigator_circuits()`](qiskit.ignis.mitigation.expval_meas_mitigator_circuits "qiskit.ignis.mitigation.expval_meas_mitigator_circuits") for additional documentation.
Fit a measurement error mitigator object from experiment data.
**Parameters**
* **result** (`Result`) Qiskit result object.
* **metadata** (`List`\[`Dict`\[`str`, `any`]]) mitigation generator metadata.
## Methods
### fit
<Function id="qiskit.ignis.mitigation.ExpvalMeasMitigatorFitter.fit" signature="ExpvalMeasMitigatorFitter.fit(method=None, generators=None)">
Fit and return the Mitigator object from the calibration data.
**Return type**
`Union`\[`CompleteExpvalMeasMitigator`, `TensoredExpvalMeasMitigator`, `CTMPExpvalMeasMitigator`]
</Function>
## Attributes
### mitigator
<Attribute id="qiskit.ignis.mitigation.ExpvalMeasMitigatorFitter.mitigator">
Return the fitted mitigator object
</Attribute>
</Class>