Hadron Inc. had losses of $4.54 million on revenue of $19.8 million in 1982, before restatement to include a recent acquisition. The year was omitted from an article yesterday.

Marriott Corp., which turned in a respectable profit performance throughout the recession, is now reaping recovery's rewards. The company reported yesterday that earnings grew 21 percent in the first half of this year and 27 percent in the latest quarter.

The Bethesda lodging and food services company earned $47.6 million ($1.71 a share) for the first six months of 1983, compared with $39.3 million ($1.44) last year. Sales increased 20 percent to $1.3 billion from $1.1 billion.

For the second quarter, Marriott's profits were $28.3 million ($1.02), compared with $22.4 million (82 cents) last year. Sales grew to $705.7 million from $600.9 million, a gain of 17 percent.

As the recession has tapered off and more people have been traveling, Marriott's businesses have been prospering, company officials said. Lower interest rates also have helped the company's bottom line.

E. C. Ernst Inc., an electrical contractor based in the District, said yesterday that claims settlements had added substantially to its profits again this year.

Ernst earned $318,000 (8 cents) in the year ended March 31, compared with $3 million (75 cents) the year before. Contract income increased slightly to $57.6 million from $57.4 million.

The firm has a backlog of $46 million, compared with $27 million last year.

Fourth-quarter profits were $1.6 million (39 cents), compared with a loss of $2.5 million last year. Contract income increased to $18.3 million from $13.2 million.

Chairman Joseph E. Griffin said yesterday that Ernst, operating under Chapter 11 of the federal bankruptcy laws, expects to emerge from Chapter 11 before Dec. 1.

Hadron Inc., a professional services firm in Vienna, posted income of $502,000 (4 cents) for the year ended March 31, a turnaround from losses of $4.5 million last year.

Revenue increased to $30.6 million from $23.2 million. On March 23, Hadron acquired Acumenics Research and Technology Inc., and the figures have been restated to reflect that acquisition. Before restatement, Hadron had losses of $4.5 million on revenue of $19.8 million. Because of the restatement, Hadron would not break out its fourth-quarter figures.