Errata

Essential Cybersecurity Science

Errata for Essential Cybersecurity Science

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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 "Date 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 Note Update

Version Location Description Submitted By Date submitted Date corrected
Printed, PDF
Page 2
2nd bullet-point - "Science creates and improves products"

The 2nd bullet-point "Science creates and improves products" finishes with the following sentence:
"For infosec decision-makers, the scientifc method can make product evaluations defensible and efficient."

The word "scientifc" is missing an 'i' character, it should "scientific"

The error is also visible in the sampler at http://cdn.oreillystatic.com/oreilly/booksamplers/9781491920947_sampler.pdf

 Angus Smithson  Jan 24, 2016  Mar 18, 2016
Printed
Page 57
Just before final paragraph

The book states:
The false negative rate is here:
(True Negatives) / (True Positives + True Negatives)



I don't believe this formula is correct, it should be:
(False Negatives) / (True Positives + False Negatives)
OR
1 - (True Positive Rate)

Given some example data:
TP: 100
TN: 15
FP: 25
FN: 5

Book equation:
TN / (TP + TN)
15 / (100 + 15)
0.130434783

Correct equation #1:
FN / (TP + FN)
5 / (100 + 5)
0.047619048

Correct equation #2:
1 - TPR
1 - (TP / (TP + FN))
1 - (100 / (100 + 5))
1 - 0.952380952
0.047619048

Note from the Author or Editor:
The formula for false negative rate should be:
(False Negatives) / (True Positives + False Negatives)

 angusws  Feb 15, 2016  Mar 18, 2016