There are numerous similarities between Scout of To Kill a Mockingbird and Harper Lee the author of the novel. Both ladies were born in Alabama. The character of Atticus Finch was based on Lee's own father, and Finch was her mother's maiden names. Lee's father was also a lawyer, and as a child she would often watch over his court cases.
The similarities go deeper, as both young ladies were accomplished in language at a very early age. On her first day of school, Scout was too educated. She was admonished to stop "letting her father teach her" because she was able to read all of her first grade reading book, along with a regional newspaper. In addition, she was able to write, but "they didn't learn how to write until third grade." Lee too, was accomplished, and she began writing stories at the age of seven.
One could also conclude, since Lee wrote so convincingly in her first, and only novel, that Scout is the voice of Lee's conscience. Addressing the world of segregation and prejudice through the eyes of a more enlightened adult looking back on childhood.The affection Scout feels for Attitucs rings true. Her emotions over the unfairness of prejudice rings true. These very well could be the true emotions of Lee herself.
eNotes has some great information.