# Stats coursework (need help- i can't remember an equation i need)

Watch
Announcements
This discussion is closed.
#1
is nasty and boring and horrid.

i'm doin my Alevel stats coursework and it's the most boring thing ever. i have one problem though- i've lent my S1 notes to a friend who is resitting it and i can't remember the PMCC equation. can anyone help please- they will get some of my plentiful rep.

lou xxx
0
16 years ago
#2
(Original post by lou p lou)
is nasty and boring and horrid.

i'm doin my Alevel stats coursework and it's the most boring thing ever. i have one problem though- i've lent my S1 notes to a friend who is resitting it and i can't remember the PMCC equation. can anyone help please- they will get some of my plentiful rep.

lou xxx
Is it:

PMCC = (Sxy)/(Sxx * Syy)
0
16 years ago
#3
(Original post by mikesgt2)
Is it:

PMCC = (Sxy)/(Sxx * Syy)
I have attatched the definitions of Sxy, Sxx, Syy
0
16 years ago
#4
PMCC (r) = Sxy
-----------------------------------
Square root SxxSyy

So thats Sxy divided by the square root of (Sxx)(Syy)

Hope this is ok.

Ta
0
16 years ago
#5
(Original post by mikesgt2)
I have attatched the definitions of Sxy, Sxx, Syy
you have to square root SxxSyy and then divide Sxy by that answer.
0
16 years ago
#6
(Original post by lou p lou)
is nasty and boring and horrid.

i'm doin my Alevel stats coursework and it's the most boring thing ever. i have one problem though- i've lent my S1 notes to a friend who is resitting it and i can't remember the PMCC equation. can anyone help please- they will get some of my plentiful rep.

lou xxx
yeh that is it n remember sxy = sum of xy - (sum of x)(sum of y)
------------------
n

sxx = sum of x^2 - (sum of x)^2
-------------
n

syy = sum of y^2 - (sum of y)^2
------------
n
0
16 years ago
#7
Well I havent got a clue about maths but i did a web search it looks like a useful site anyway

http://www.mathsnet.net/asa2/modules/s14calcpmcc.html
0
16 years ago
#8
(Original post by Specialheffa)
you have to square root SxxSyy and then divide Sxy by that answer.
Yeah, sorry. I was doing it from memory and I havn't touched stats since I took S1 in the summer.
0
#9
(Original post by sspllr)
yeh that is it n remember sxy = sum of xy - (sum of x)(sum of y)
------------------
n

sxx = sum of x^2 - (sum of x)^2
-------------
n

syy = sum of y^2 - (sum of y)^2
------------
n
cheers, that's great- i couldn't remember what Sxy etc. were.

lou xxx
0
X
new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### If you do not get the A-level grades you want this summer, what is your likely next step?

Take autumn exams (156)
45.48%
Take exams next summer (52)
15.16%
Change uni choice through clearing (81)
23.62%
Apply to uni next year instead (38)
11.08%
I'm not applying to university (16)
4.66%