It's easier to forecast earnings at a company selling technology, even to businesses, than it is to forecast performance for companies involved in more volatile areas like commodities or, at present, finance.
Mr Engle's high-powered maths has made market risk easier to forecast.
And buying will probably be concentrated in blue chips where earnings growth is easier to forecast than it is for technology stocks.
For example, in the United States the weather is far easier to forecast because the country forms part of a very large landmass".
The outlook might be easier to forecast if the fiber networks truly resembled the two older networks to which they are often compared: highways and railroads.
But it's no easier to forecast a hit in this business than in Hollywood.
For example, temperatures may be more stable and easier to forecast in one region compared to another.
But the success of Euro 2000 was easy to forecast.
The implications of the team's latest outside financing are not easy to forecast.
It would be easy to forecast a chilly reception in the team's temporary home.
