Basic HTML Version
Q
uantitative
R
easoning &
P
roblem
S
olving
242
© 2014 Pacific Crest
Technique
P
rojection
Category
Ease of Use
Mapping
➎
Description
The graphical mapping of data values into a two or three dimensional spaces
Benefits
Limitations
Creates a visual representation of data
Can’t project if there is missing data
Tool
GPS software or 3D graphing systems
Application
Mapping, GPS systems, Computer Design software
Example
f(x,y,z)=(x,y,0) will project the point (x,y,z) onto the xy-
plane
Technique
S
ample
Category
Ease of Use
Reduction
➍
Description
Take a random sample from the data for performing a sub-analysis or modeling
exercise
Benefits
Limitations
Very useful for simulation models
The sampling is limited to the data in the data set
Tool
Sample
Application
Getting a subset of data from a data set
Example
Sample(table,10%)
Technique
S
ample
(
with
replacement
)
Category
Ease of Use
New Data Set
➍
Description
Picking a random set of observations from the data for modeling purposes
Benefits
Limitations
In simulation and mathematical modeling provides
real data inputs
The quality of the sampling is based upon the
strength of the data itself.
Tool
Sample
Application
Simulation of anything
Example
Samplerep(table,number)