In lecture https://julia.quantecon.org/dynamic_programming/perm_income.html the link this discussion has the link https://julia.quantecon.org/dynamic_programming/tools_and_techniques/linear_models.html#lm-fgs instead of https://julia.quantecon.org/tools_and_techniques/linear_models.html#lm-fgs
In lecture![image](https://user-images.githubusercontent.com/6542997/65930479-4271a380-e449-11e9-81d7-1e9b7d546600.png)
https://julia.quantecon.org/dynamic_programming/perm_income.html
the linkthis discussion
has the linkhttps://julia.quantecon.org/dynamic_programming/tools_and_techniques/linear_models.html#lm-fgs
instead ofhttps://julia.quantecon.org/tools_and_techniques/linear_models.html#lm-fgs