Problem: contrib-prib-functions ---Corelationship, Covariance

Help get results. I do not understand what is needed to get the result.

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        "type": "Data Analysis",
        "z": "eec42e70b4f2e4e6",
        "name": "Covariance",
        "action": "covariance",
        "columns": "",
        "outputs": 2,
        "outliersBase": "avg",
        "outliersStdDevs": "3",
        "term": "10",
        "keyProperty": "msg.topic",
        "dataProperty": "msg.payload",
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]

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