Health and Human Services Secretary Kathleen Sebelius acknowledged yesterday that the federal government's Oct. 1 rollout of online health-insurance marketplaces did not go smoothly, but she stood by the government's decision not to delay the nationwide launch. "There is no question that the website had a rocky start," Sebelius said during a visit to the Main Library Downtown. "I am first to say we wish it could have been a lot smoother from Day One." But she said the healthcare.gov website is functioning better than it was two weeks ago. The federal government's online system cost more than $400 million to create, The New York Times reported this week.