What was going on when I was born?

The Reagan Administration, openly offering tax concessions to win votes in the House of Representatives, today introduced still another version of its three-year tax-relief bill that included future automatic ''indexing'' of tax brackets to offset inflation. With voting in the House scheduled for next Wednesday, President Reagan and Vice President Bush exhorted House Republicans at a rally to stick by their President and party. Mr. Bush, acknowledging that Republicans might ''have reservations'' about some provisions in the Administration bill, said they should vote for it anyway because ''it is important that the President be perceived as moving the country forward.'' Countered by Rostenkowski In a counterthrust a few hours later, Representative Dan Rostenkowski of Illinois, the Democratic chairman of the Ways and Means Committee, contended that the Democratic bill would give more tax relief to ''the working poor.''

SEGMENTED BUS TESTED: Passengers boarding a 60-foot bus for a demonstration yesterday near City Hall. The 63-seat Hungarian vehicle, hinged to facili-tate turning, is 20 feet longer and has 50 percent greater capacity than a standard bus. It is in use in Louisville, Ky.; San Mateo, Calif., and many cities in Europe.

Puerto Rico, which will bear the full brunt of Federal budget cuts but get none of the benefits of proposed tax reductions, is already feeling the effects of the loss of Federal programs, and officials here say a huge new wave of migration to the mainland will ensue if help is not provided. Unemployment on the island, which has a population density 15 times the national average, has risen to 20.4 percent from 18 percent since workers under the Comprehensive Employment Training Act lost their jobs. In many towns, the unemployment rate is as high as 40 percent, and there are no jobs to be had. Baltasar Corrada del Rio, the commonwealth's Resident Commissioner in Washington, said, ''My deep concern is that by late 1982 or early 1983 the Federal Government will have developed policies which will create great pressures on thousands, possibly hundreds of thousands, of Puerto Ricans to migrate from Puerto Rico to the United States mainland, mostly to such states as New York, New Jersey, Connecticut, Massachusetts and Illinois.''

A series of unusual bail hearings for inmates at the Westchester County Jail has ended, with 24 men and one woman walking free to await court action. The hearings, held in the jail's gymnasium, its women's unit and in court, also resulted in the lowering of bail in 107 cases, it was announced today by Justice Joseph F. Gagliardi of State Supreme Court, who supervised the hearings. A total of 323 cases were heard in four days. The bail reviews grew out of a statewide directive that a monthly review process be established for inmates awaiting trial. The directive, issued by the chief administrative judge of New York State, Herbert B. Evans, went to administrative judges around the state on July 13.

In Senate confirmation proceedings this year, William J. Casey, now the Director of Central Intelligence, failed to disclose stock holdings in one corporation and the receipt as a gift of a $10,000 interest in another business venture, according to a review of public records and information provided by a close business associate. In a personal financial disclosure statement presented to the Senate Intelligence Committee last January, Mr. Casey said that he had not received any gifts worth more than $500 in the last five years. Account by Business Associate However, a longtime business associate, Carl G. Paffendorf, said in interviews this week that in November or December 1976 he gave Mr. Casey a $10,000 interest in Penverter Partners, a limited partnership engaged in development of computer technology. Mr. Paffendorf said that Mr. Casey gave him a nominal sum of $100, but he repeatedly characterized Mr. Casey's interest, which he said is now worth $20,000, as a ''gift.'' Mr. Casey, responding to questions through a spokesman for the Central Intelligence Agency, said he believed that he had paid ''some nominal consideration'' for the Penverter interest. He said he considered the transaction a purchase and not a gift, but he acknowledged that he did not know the value of the interest when he acquired it.

United States officials said today that the suspension of fighting across the Israeli-Lebanese border should be followed by vigorous efforts to end the civil war in Lebanon. They said the cease-fire should also be used to restore ''movement and momentum'' to the broad Middle East peace negotiations growing out of the 1978 Camp David agreements. In public, official spokesmen said that President Reagan had made no decision on ending the suspension of deliveries of 10 F-16 fighter-bombers to Israel. But public statements suggested, and private comments of some officials strongly reinforced the impression, that if today's cease-fire held for a reasonable number of days without major violations the President was likely to resume the F-16 shipments. The deliveries were held up after the Israeli bombing of an Iraqi nuclear reactor on June 7 and suspended indefinitely after the Israeli raid on Beirut on July 17.

Several Republicans and Democrats on the Senate Select Committee on Intelligence today urged William J. Casey to resign as Director of Central Intelligence, going beyond the suggestion made last night by their chairman, Senator Barry Goldwater, that he consider stepping down. In response to what one White House aide called ''an apparent crumbling of support'' for Mr. Casey, President Reagan issued a terse statement expressing support for his former campaign chairman but noting that his staff was following developments in the situation. ''We are cooperating fully with the Senate Committee and my staff is following the matter closely,'' Mr. Reagan said in a statement issued at midday. ''As I said earlier today, I have not changed my mind about Bill Casey.'' Denied Several Charges Mr. Casey also issued a strong statement today denying allegations concerning his involvement in a New Orleans agribusiness concern. He also met with committee members and with the Senate majority leader, Howard H. Baker Jr. of Tennessee.

The Palestine Liberation Organization announced today that it would abide by what it termed a cease-fire arranged by the United Nations. The cease-fire began at 5 o'clock this afternoon (11 A.M. New York time). The Israelis began their cease-fire at 1:30 P.M. local time (7:30 A.M. New York time). The Palestinians delayed their adherence to the truce until after the announcement was made in Jerusalem by Philip C. Habib, Washington's special envoy. The delay by the Palestinians was seen as an apparent effort to portray Israel as having been the first to agree to a cease-fire.

A Federal judge in Brooklyn yesterday rejected claims by seven Abscam defendants, including four former Congressmen, that they had been unfairly induced by overzealous Government agents to engage in criminal acts. Ruling that none of the defendants' constitutional rights had been violated, the judge upheld their convictions, refused to grant them new trials and ordered them to appear for sentencing on Aug. 13. In so doing, the judge supported the Federal Bureau of Investigation's use of undercover techniques in the Abscam investigation into political corruption and said that because bribery was a secret crime, law enforcement authorities needed ''considerable latitude'' to detect it. The 136-page decision by Judge George C. Pratt of Federal District Court commented on ''corrupt leaders'' who ''not only betray their constituents but also contribute to a moral decay in American society.'' ''Despite their respected and trusted positions,'' the judge said, ''defendants' crass conduct here reveals only greed, dishonesty and corruption. Their major defense has been that they were tricked into committing the crime on videotape. The Government's need to unmask such conduct more than justifies the investigative techniques employed in these cases.''

Israeli and Palestinian forces agreed separately today to a cease-fire across the Israeli-Lebanese frontier. The Israeli and Palestine Liberation Organization announcements came three and a half hours apart. Israel said the agreement had been negotiated by the United States. The P.L.O. said it had been reached through the auspices of the United Nations. Israel's Cabinet agreed to halt attacks on Palestinian positions in Lebanon as of this afternoon, reportedly on the condition that Palestinian guerrillas refrain from any further military buildup in the southern part of Lebanon.

Three revolutionary guards were reported slain in Teheran today as Iranian voters went to the polls to decide which of four candidates will succeed the ousted President, Abolhassan Bani-Sadr. Prime Minister Mohammad Ali Rajai, supported by the ruling Moslem clergy, seemed assured of a landslide victory after his three opponents announced their support for him, although their names apparently remained on the ballot. The state radio said other areas of the country were calm as Iranians voted ''enthusiastically'' and in great numbers. The broadcast, monitored here, said two of the revolutionary guards were fatally shot by leftist gunmen and that a third was killed by a bomb. It added that two civilians had been killed in another bomb explosion.

A grieving woman, lighting candles at the four corners of a body covered by a sheet, appeared on the television screen. It might have been her husband, daughter, son, or a friend killed by the political violence. A narrator asked viewers if they wanted the violence to continue. The bereaved woman said, ''El Salvador deserves your vote.'' The public service announcement has been taken off the air, to the relief of many Salvadorans who were troubled by the negative approach of associating elections and democracy with death.