How would you identify the cuase of a Google penilty?

[shanken]

Originally Posted by ketul

If you have noticed a traffic drop in your stats program, you are more likely to be hit by any of these algo and it’s updates. you need to determine is which algo hit your site.

1) Panda hit usually happens due to low quality content, poor SEO stricture and few other factors.

2) Penguin hit usually happens due to low quality link and bad linking (Internal and external)

Once you determine which algorithm caused penalty to your site, it will be easier to take constructive steps and get out of Google penalty.

Very good answer. The question is how do you determine by which you have been affected by.