There was a website…I got to dig it up. But the short story is that news don’t work too.
A good resouce you can try is OANDA FXLabs which are some useful tools from oanda. For example, you can see what are the historical effects of news on prices, or correlation of pairs, or etc etc.
If you pickup any forex books (Kathy lien’s book is good), most will give a list of factors that they think affects the currency of a country. For example GDP, investment $ flow, resources, manufacturing, oil supply etc. However, it comes to a point that once you count >20 you realise that there are too many factors to be realistics.
In the end, most traders only trade support and resistance lines plus trend plus whatever indicators they are taught.