GEORGIANA, Ala. — Four days before an Alabama Senate election with broad implications for American government, the narrow questions of whether Roy S. Moore wrote in a high school yearbook 40 years ago, and what it means for sexual misconduct allegations against him, once again took center stage on Friday.

Beverly Young Nelson, the woman who has accused Mr. Moore, the Republican candidate, of misconduct, acknowledged on Friday that a few of the words in her yearbook under what she said was an inscription by Mr. Moore were written by her, not him.

At a news conference with Ms. Nelson, her lawyer, Gloria Allred, released the findings of a handwriting analyst who concluded that the signature on the inscription belonged to Mr. Moore.

Since charges of sexual misconduct surfaced last month against Mr. Moore, a former chief justice of the State Supreme Court, they have dominated the race between him and the Democratic candidate, Doug Jones. On Friday, the Moore camp and Ms. Allred each seized on the developments to accuse the other of dishonesty.