Errata

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The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question



Version Location Description Submitted By Corrected
Printed Page iv
"Other books in O'Reilly's Head First series"

There is one Head First book missing from the list: Head First C#

Note from the Author or Editor:
the reader is correct

 Bill Mietelski 
Printed Page 53
Marketings last comment

Marketing: ... but we'll be sacrificing out profit margins forever if we cut prices (not costs). They are talking about reducing the customer's price for the product, the the cost to produce the product.

Note from the Author or Editor:
"we'll be sacrificing our profit margins forever" should be changed to read "we'll destroy our brand image"

 Anonymous 
Printed Page 75
1st paragraph

..there's an tool of data analysis... should be: ..there's a tool of data analysis...

Note from the Author or Editor:
the reader is correct

 Pete Aven 
Printed Page 97
Middle

The memo states that only 80 fish and 20 ducks were sold. The graphs and excel spreadsheets listed on pages 101-103 do not support the memo's claim.

Note from the Author or Editor:
On page 101, remove the annotation "Here's the most recent month, when everything went wrong."

 royk4 
Printed Page 180
Bottom of page

The labels don't map to the variables. Either I'm missing something. But in the example we tested positive for lizard flu, and the numbers used for calculation correspond to the positive, but the labels all refer to the negative: The probability that you have it, given you tested negative (should be positive) # of people who have it and tested negative (should be tested positive) similar for the denominator, as well as the fill in the blanks on page 179.

Note from the Author or Editor:
There is an error here. The math is correct -- there is a 9% chance that you have lizard flu. But the equation itself is incorrectly worded. It should be: The probability that you have it given you tested positive = # people who have it and test positive / (# who have it and test positive + # who don't have it and test positive) The error should be fixed on both p 179 and 180.

 Pete Aven 
Safari Books Online 182
the bottom formula

P(L|+) = P(L)P(+|L) ----------------------- P(L)P(+|L)+P(~L)P(+|~L) The original formula's P(-) should be replaced with P(~L).

Note from the Author or Editor:
this is indeed an error and should be corrected as he says

 Anonymous 
Printed Page 222
1st sentence

How does the now distribution of beliefs ... look? shouldn't it be: How does the distribution of beliefs ... look now?

Note from the Author or Editor:
the reader is correct. his suggestions should be implemented.

 Pete Aven 
Printed Page 302
Correlation up Close : 1st Sentence

How do you got ..., should be: How do you get ...

Note from the Author or Editor:
the reader is correct. "How do you got" should be "How do you get"

 Pete Aven 
Printed Page 377
Comment regarding the WebComments table

The comment about the WebComments table begins, "This tables is new...". The comment should begin "This table is new...".

Note from the Author or Editor:
The reader is correct.

 Scot McDermid 
Printed Page 381
The figure and the comment.

The last sentence in the comment at the bottom of the page begins "Nike has a pretty big spread...". In the figure there is no author with the name "Nike". However, there is an author named "Niko" and Niko does have a pretty big spread.

Note from the Author or Editor:
Yep, it should be Niko at the bottom instead of Nike.

 Scot McDermid 
Printed Page 423
Annotation for "y = a + bx" equation

"You use data this equation to predict" should be "You use this equation to predict"

Note from the Author or Editor:
the reader is correct

 Bill Mietelski 
Printed Page 423
Bottom equation, second line of top callout

Possible word substitution of "verbal" for "variable."

Note from the Author or Editor:
yes, the world should be "variable"

 Curtis Frye 
Printed Page 427
1st paragraph

pretty sure 'word-class' should be 'world-class'

Note from the Author or Editor:
the reader is correct

 Pete Aven