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# Chapter 9: Repetitive experiments: probability and frequency

• p. 282, second line after (9.24): '' should be  ''.

• p. 285, last paragraph: How many terms are in the sum (9.39)?'' should probably be How many choices of are there that sum to ?'' or How large is the set ?''

• p. 286, second half: '' (both places) should be ''.

• p. 289, section 9.8, first paragraph: From (9.28)and (9.29) we see...'' These equations don't seem to have anything to do with what follows.

• p. 292, equation (9.78):  '' should be  ''.

• p. 297, equation (9.94): The preceding text, we express (9.88) in decibel units as in Chapter 4:'', is misleading, as is not for some hypothesis . To make sense of what follows in this section, use the equality

• p. 305, second paragraph: where depends only on the data and is non-negative over '' should be where depends only on the data and , and is non-negative over ''.

## Miscellaneous commentary

• p. 300, section 9.12: This criticism of the (Pearson) chi-squared statistic is both fair and exaggerated: Jaynes is correct, but (1) its sensitivity to small expected frequencies has been well rehearsed in many texts, including elementary treatments; (2) the alternative given here, the likelihood ratio chi-squared statistic, has long been available (since about 1930). [Contributed by Nick Cox.]
• p. 304, first (partial) paragraph: Jaynes is correct, but dependence on published tables is totally avoidable given modern software, and practice is steadily swinging to citing P-values rather than using conventional levels such as 5% and 1%. [Contributed by Nick Cox.]