How are measuredMessagePeriod, SyncTimestamp, SyncRateRatio calculated for PTP?

edit

How are you with "C" code?
It's possible to work back from the field definitions in the code to where they are set to a value.
You would start here and work back to where value is set: epan/dissectors/packet-ptp.c:

        { &hf_ptp_v2_analysis_sync_period,
          { "measuredMessagePeriod", "ptp.v2.analysis.sync.measuredMessagePeriod",
            FT_DOUBLE, BASE_NONE, NULL, 0x00,
            NULL, HFILL }
        },

Or you can try contacting the author/contributor by adding a comment to the merge request:
5929: PTP: Analysis of Message Intervals (Sync and PDelay_Req)