This is Luke Surl (Luke’s URL). Many of the comics are equations.

]]>I’d go with that.

]]>I think the “Amount” is plotted for 0, 1, and 2 parents, with a line drawn between them.

I suspect that a (amount shared) value would be higher for n > 2 if d (divorce) = 0. Otherwise it would continue to go down.

]]>Still no. The number of parents on Facebook is still a discrete variable, for either one of two definitions of “on Facebook”: a) having an account, or b) being logged in. In both cases, the variable would vary over time, but it would still be impossible to have a fraction of a parent on Facebook either way. The main difference would be that in the case of b, the variable would change a lot more often.

In order to treat it as a continuous variable and make sense in the way you suggest, then you could change the x-axis to involve time in some way (e.g. taking the time-average) and then something like fraction of parent-hours on Facebook (or average hours spent by parents on Facebook per week, introducing a constant factor of 168 to the x-axis numeric value) would be much more appropriate.

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