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matheusfacure / python-causality-handbook

Causal Inference for the Brave and True. A light-hearted yet rigorous approach to learning about impact estimation and causality.
https://matheusfacure.github.io/python-causality-handbook/landing-page.html
MIT License
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Chapter 03 - Correction when explaining ppf #256

Closed Lucas-Okamura closed 1 year ago

Lucas-Okamura commented 2 years ago

There is an issue on chapter 03, in the following paragraphs "(...) saying that 50% of the mass of the standard normal distribution is below 0.0." and "(...) In other words, 0.05% of the mass falls above this value."

It should be "(...) saying that 50% of the mass of the standard normal distribution is below the sum between the mean and 0.0 times standard deviation." and "(...) In other words, 0.5% of the mass falls above this value.", respectively.

donelianc commented 2 years ago

I made PR #257 to fix the second suggestion from @Lucas-Okamura's comment.

I left the first suggestion to @matheusfacure since it looks like a wording issue.

But agree with Lucas since the standard normal distribution doesn't imply that the distribution's mean is 0 (although it's pretty common to use a distribution with mean=0 to facilitate calculations and examples maybe that's why Matheus wrote "below 0.0").