/sci/ - Science & Math

anyone on /sci/ self-employed after their B.Sci ?

I'm assuming you have a degree along the lines of maths, physics, chemistry, etc (something with modeling)

I once heard a long time ago that someone from /sci/ basically sits at home with Excel maybe 4-5 days out of the week and plays the stock market.

I'm not looking for tips but this is something I'd like to do my undergraduate research project on, since I would like to be a financial quantitative analyst (double major math/comp sci right now) after someone posted that quantfinancejobs website that gave credit to the PhD in math, 300k starting, any job I want meme

I'm not looking for investment tips (technology seems to be the only "stable" market imo, something I'd like to build my portfolio around one day) but rather methods for doing this and what to monitor in terms of data.

im in an intro to mathematical modeling with excel class, and right now we're using least squares regression to make simple models. Eg. the number of patients/doctor and its effect on life expectancy.

I'm looking for something I can use to play those free online stock market games with monopoly money. Also, if anyone would be interested, maybe we can all compete?

Any tips/suggestions? thanks in advance guys

By any chance would anyone happen to have "Human Genetics" by Bruce Korf on .pdf?

Serious question /sci/

been reading up on mathematical statistics. this post regards mean and variance.

<span class="math"> \frac{1}{n-1} \sum_{i=1}^{n}(y_{i} - \bar{y})^{2} = \frac{1}{n-1} \left[ \sum_{i=1}^{n}y_{i}^{2} - \frac{1}{n} \left(\sum_{i=1}^{n} y_{i}\right)^{2}\right] [/spoiler]

I use definition of mathematical mean to get the proper form of y-bar, and used the property of summation that the summation of the sum of two terms is the summation of the first term plus the summation of the second term.

I don't know what the frack to do with the power of 2. Intuition says to use multiplication of two binomials but that just gets really messy and not even what I want.

Do I just distribute the power of 2 to the two summations? Is there a property of summation that allows me to do it?

Thanks in advance guys

Bumping with Penguins

The result of the little albert experiments said fear is something that is learnt...

I don't agree with this... Does a fly learn to be scared of a fly swatter.. Does a antelope learn to be scared of lions?

Doesn't add up to me.

>be 15
>Popular science understanding of QM
>thought it was so fucking cool
>be 20, Jr. in college
>when I do QM now I have to dissociate from reality to even engage my mind at this level
>I don't even have a face anymore

please tell me i am not alone

I come on this board to laugh at all the ugly autistic neck beards that think they're special for some reason. you are pathetic and no one loves you.
>tall
>handsome
>engineering student

fuck you losers

Hey /sci/, headed off to college next semester. I'm pursuing an some sort of an engineering degree, most likely mechanical.

What kinds of things should I study before hand to get an edge over the competition?

Hey /sci/ i'm looking to expand horizons and fill my day with more rewarding activities opposed to smoking weed and playing video games. The thing is I already do a lot of physical things and i'm looking for mentally stimulating things.

>I want to do something musical, considering bass, piano, or djing/mixing edm.
>Considering learning about a random topic either intellectual or practical. Thinking chemistry, philosophy, nutrition, auto-repair, i'm pretty open.
>Maybe something literature orientated, more reading couldn't hurt
>Other than drawing, art doesn't really interest me
>I already spend lots of time socializing and being outdoors

I am trying to understand something, but I just don't. From this sentence could you explain or say it to me in other words please? :

If all population elements have exactly the same value of the characteristic (it's this first part I don't get), then a sample of 1 is all that is needed to represent the population.

Definitely Alian naow

Does anyone know if it is it possible to convert a Chemical Abstract (CAS) Registry number into a Global Trade Item Number (GTIN) by some means of formula?
This is for a database and so it would help if we could just convert everything from CAS to other forms, but I can not find anything about simply converting CAS into GTIN, or any other form such as a common name or InChl format which could then be converted into a GTIN code?

/sci/ in particles, and their interaction, namely force, what is the series pertaining to their 'muscle'? Or do they just give into eachother

Can you help me with this one?
http://prntscr.com/1bdolm

Next year, I'll be a junior in high school and will be taking AP Calculus. What can I expect throughout the year? Also, suggest things I should google to familiarize myself with some of the topics.

If anybody could give a (preferably very) detailed explanation for why combustion is necessary, how combustion works, specifically alcohol combustion, and how molecule size affects the rate of combustion, you would be a tremendous help.

Hiya /sci/
I'm trying to prove that the following function is injective:

Consider the function f: <span class="math"> \mathbb{N}^{+} \times \mathbb{N}^{+} \rightarrow \mathbb{N}^{+} [/spoiler] given by <span class="math"> f \left(m,n\right) = 2^{m-1}\left(2n-1\right) [/spoiler]

I get to the following:

Assume <span class="math"> f \left( m_{1} , n_{1} \right) = f \left( m_{2} , n_{2} \right) [/spoiler]

So, <span class="math"> 2^{m_{1}-1}\left(2n_{1}-1\right) = 2^{m_{2}-1}\left(2n_{2}-1\right) [/spoiler]

I'm not sure how to use this to prove m1 = m2 and n1 = n2. Can I say by uniqueness of prime factorization, 2^(m1)-1 = 2^(m2)-1 and 2(n1) -1 = 2(n2)-1 ?

Does /sci/ think I have a case for banning the general education requirement in the United States?

Gen Eds are parasitic classes that do nothing other than distract students from their real interests. I feel as if my major GPA (and general GPA) has suffered due to the added stress of having to complete menial assignments and fulfill writing requirements. Furthermore, these classes prevent me from realizing the full value of my degree. As mathematics being one of my majors, Gen Eds prevent me from taking the classes in the catalog that would boost my value to future employers, such as Analysis and Statistics classes. In other words, Gen Eds LOWER the value of my degree, which causes me unwarranted hardship. Gen Eds are nothing more than an immoral attempt to suck as much money as possible out of students and are defiling the sanctity of a college education.

how do i prove that the consecutive quotients of the fibonacci series converge to fi?
Fn+1/fn= Fi when you take n to the infinite.

Do humans have a soul, or are these fairy tales?

How does a low-pass filter circuit with signal inversion look like? Is it the same thing a a low-pass filter with Op Amp Buffer?

Lets prove that modulo arithmetic is a partial order on the set of real numbers for any integer we choose!

Lets say our relation is anti-symmetric and reflexive...
<span class="math"> x \setminus_{Int} y \Leftrightarrow \exists z \left(z \in \mathbb{R} \wedge x - y = z \right) [/spoiler]

...and we need to show it's transitive:
<span class="math"> \forall x \forall y \forall z \left[ xRy \wedge yRz \implies xRz \right] [/spoiler]

For simplicity sake, can I say:
<span class="math"> \exists w \left( w \in \mathbb{R} \wedge \left[ \left( x-y = w \wedge y - z =w \right) \implies x - z = w \right] \right) [/spoiler] ?

>>5682826
I'm sorry