As per Courtney’s teachings, we derive the PEG ratio from Yahoo Finance, which is based on an average for comparison categories.
You can refer to this video (https://wealthbuilder.customerhub.com/stock-success-school/how-to-pick-the-best-of-the-best-video-part-2) around the 14-minute mark.
You will notice that the PEG Ratio (GARP method = Growth at A Reasonable Price) is the PE Ratio divided by Expected Growth.
On Yahoo, the PEG Ratio uses the PE Ratio average for the comparison category, and this is no longer available as a unique value. Over time, the PEG Ratio has also moved from the Analyst Estimate page to the Key Statistics page.
This is likely why you will find different PEG Ratio value.
For now, in compliance with Courtney’s technique, we use the PEG Ratio from Yahoo as our baseline. In the future, if this value ceases to be available, we may switch to the Forward P/E .
Thank you