Location, Spread, Coding and Representation Flashcards
1
Q
Mean
A
Ex / n or Efx / Ef
2
Q
Describe IQR
A
IQR = Q3 - Q1. It ignores extremes
3
Q
Variance
A
Mean of the squares - square of the means
4
Q
Linear coding, if y = ax+b
A
Mean = a xbar + b
Variance = a^2 x variance
5
Q
Frequency density
A
frequency/class width
6
Q
What is PMCC
A
PMCC is between -1 and 1, measures strength and +- of correlation
7
Q
Exponential/non linear models when y = ab^x
A
lny = lna + xlnb
8
Q
Exponential/non linear models when y = ax^n
A
lny = lna + nlnx
