Corrections made in second printing. Corrections are listed by the name of the psd and ps files, which is based on the page number(s) affected. pg047 Figure referred to in fourth-last line was incorrect. pg210 Subscripts on \sigma in first two lines were added. pg213-4 Page 213, the two equations above (7.10) were rewritten in a more natural way. The originals were correct, though. Page 214, zero in the last display should not have in boldface. pg218 Unneeded parentheses removed in (7.25). pg230 "=" replaced by "\equiv" in (7.45) and (7.46). This page was corrected again in the seventh printing. pg271 Two missing words added in first sentence. Also, y_n changed to y^n in (8.57), (8.58), and (8.59). pg282 The \beta on the l.h.s. of (8.83) should not have been boldface. (this page corrected again in fifth). pg297 Sentence following (9.20) was rewritten to make it clear what is being referred to. pg348 Serious errors were corrected in the only equation on this page. A minor correction was made in the seventh printing, so the page is found there. pg351 Wrong equation number was referred to just after (10.56). Also, unneeded parentheses removed. pg362 1.778 changed to 1.771 in eighth line from bottom. This page is found under seventh, due to a later correction. pg380 In (iv), incorrect reference to (iii) and (iv) changed to (ii) and (iii). pg438 Incorrect and unnecessary symbol removed after "information matrix", following (13.09). pg474 Minus sign added just before unnumbered equation following (13.84), and missing acute accent added in equation (13.85). pg477 Reference changed from 1992 to 1992a. pg521 Paragraph in middle of page was wrong. New one completely replaces it. Equation numbers changed to avoid a gap. pg581 Several references changed from 1992 to 1992a. (Also on page 580, but it has further corrections in fourth printing). pg692 Reference changed from 1992 to 1993. pg694 Reference changed from 1992 to 1993. pg752 Reference changed from 1993 to 1992b. pg755 Reference changed from 1993 to 1992b. pg821 Reference updated. Due to a later change, this page is found under the seventh printing. pg826 Reference updated. pg859 Minor error in subject index corrected. pg872 Serious error in subject index corrected.