In short, the third implementation is 100x faster than the first implementation with only minor changes to the code I originally wrote. Given the interpretation of economic agents as rational, this exempts time-valuations from rationality judgments, so that someone who spends and borrows voraciously is just as rational as someone who spends and saves moderately, or as someone who hoards his wealth and never spends it: different. Sometimes it is explained as the degree of a person's patience. Since more distant events are less liked,.displaystyle 0 beta. On my laptop, implementation 2 takes.25 seconds to run.
Because several of these models arent widely used, Ive had to write my own maximum likelihood code to estimate the parameters of these models. The three implementations of this model that Ill show only differ in the definition of the log likelihood function, so the final call to optim to perform maximum likelihood estimation is constant across all examples: timator - function(choices) wrapper - function(x) kelihood(choices, x1, x2) sults. Recently, Ive been fitting some models from the behavioral economics literature to choice data. The great companies and the leaders who built them were not luckier than the comparisons, but they did get a higher Return on Luck.
On my laptop, implementation 3 takes.01 seconds to run. Hopefully this example will help inspire others who have R code theyd like to speed up, but arent sure where to start. With a team of more than twenty researchers, Collins and Hansen studied companies that rose to greatness - beating their industry indexes by a minimum of ten times over fifteen years - in environments characterized by big forces and rapid shifts that leaders could not. In the process, Ive started to learn something about how to write code that runs quickly. The first implementation Ill show is the one I find most natural to write, even though it turns out to be the least efficient by far: kelihood - function(choices, a, delta) ll - 0 for (i in 1:nrow(choices) u2 - lue(choicesi, 'X2 choicesi, 'T2 delta). They include 10Xers; the 20 Mile March; Fire Bullets then Cannonballs; Leading above the Death Line; Zoom Out, Then Zoom In; and the SMaC Recipe.