General Discussion
In reply to the discussion: No, Obamacare is not making your insurance premiums go through the roof. [View all]Donald Ian Rankin
(13,598 posts)This article kind of looks like it's chosen to focus on the second derivative of price with regards to time, because that's the one that supports the case it wants to make, when arguably the first derivative is more relevant.
If you cherry-pick your derivative, you can always find one that's doing what you want.
Now, it's by no means obvious that the second derivative is the wrong measure - if you interpret first derivative as representing "conditions" then second derivative is where a change in conditions - like "the introduction of Obamacare" - would show up. So one could certainly make a case that the measure the article chooses to focus on is the right one.
But the fact that this article doesn't even discuss this, and presents its case so emphatically and confidently, makes it look more like cherry-picking for propaganda rather than open examination of all the numbers with a goal of informing.