/sci/ - Science & Math

tfw you'll never get stuck in a pattern buffer

>>9284627
Oh, those poor space nazis!

what's a good book/online course to learn math needed for digital signal processing? i need to brush up complex algebra. stuff from cal 2 probably. thx

can someone explain entropy to a fool?

my understanding is that as a system develops order, or more accurately, a reversable phase transition, it has to cause another system to develop chaos, or an irreversible phase transition, and time is unidirectional because the total system can never be replicated; you can replicate one region with another region's previous state, but the totality can't reproduce because the necessary energy is lost in an energy well of some sort.
also, how would entropy apply to quantum space and the uncertainty principle's conclusion that you can't define empty space? is this paramount to a framework where a system would have to have an undefinable region of space where there's so much certainty that you couldn't develop phase transitions, and it's too ordered?

>tfw I will fail my math finals

Hello,

I'm currently working on a exercise paper in statistics, and I encountered a problem in STATA.

I am trying to generate two factors out of seven endogenous variables, the idea being using one of the factors as a dependent variable in a regression and the other as one of the predictors.

Everything went smoothly, I got a nice model fit, nice coefficients etc.. But when I hit predict X, latent(X), it gives me some weird shit. The factor is generated, but it does not at all have the scale of the variable whose coefficient got fixated to 1 (1-7, 1-4). It has a scale ranging from somewhere below zero to just about above zero. I don't know why.

At first, I thought they were standardized automatically, but then they would have a variance of 1 and a mean of 0, wouldn't they?

Has anybody ever encountered a similar problem? Is using the predict command wrong in this case somehow?

i Still canit beleive that penies go into gineys and the willy shoots spermies and they swim to an egg but mmillions die and only one makes it and that you!