A union job at a shipyard, mine or factory usually comes with a steady paycheck, but some U.S. industrial companies are having a hard time figuring out who their typical workers are and how much they make.

Several S&P 500 companies in the industrials and materials sector posted big swings in what they said their median worker was paid in 2018 compared with 2017, according to an analysis by The Wall Street Journal of annual disclosures for hundreds of big U.S. companies as provided by MyLogIQ.

Shipbuilder Huntington Ingalls HII -0.88% Industries Inc. and potash producer Mosaic Co. MOS -0.72% reported the typical worker got half as much as the year before. At Honeywell International Inc., HON 0.06% it was 33% higher.

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