Starting with two closely spaced data
points on the graph below, lay a straight - edge between them and notice how for a short period of time you cancreate almost any slope you prefer, simply by being selective about what data points you use.
Not exact matches
We will then wait a little for the price level to increase above this
point (support line) as soon as the price drops
below the support line again; we would consequently enter a trade heading
on the same course the
graph is heading once it drops
below the support line.
The first
graph below, in which each data
point relates the average socioeconomic index score for a decile of a particular OECD country's students to that decile's average performance
on PISA's math test, depicts this relationship.
The white
point is pretty much off target which you can see in the
graph on the right side
below.
I am afraid that the message people will take from your
graph is: «Hey, even the AGW - scientists get a cooling trend» (because the leftmost
points are
below zero), while not realising that a trend based
on a few years (and hence the whole
graph) is rubbish.
I note that almost the entire UAH
graph is
below the others because of the dependence
on a single
point baseline (Jan 1979).
On this
point, I love the
graph below, except for the minor problem that it is wrong.