Stats And Mapping Flashcards
1km =
5,000 feet
Township section
1 square mile
640 acres
Slope
Rise / run x100
Nominal data
Numbers and symbols
Does not lend to mean median mode
Ordinal data
Ranking of data (I.e.) height
Qualitative variables
Nominal, sometimes ordinal
Quantitative data
Interval or ratio
Skewed data represents
Outliers
Bias
The difference between an expected value and the real value; resulting from faulty design or execution
*increasing sample size will not fix this
Acs
Includes typical data, health insurance, vet status, etc
1 year: 65k+ population
5 year: small population; most reliable
Order of census places
Regions
Divisions
States
Counties
Places
Census tracts
Block groups
Census blocks
Census blocks
Smallest unit for 100% tabulation; 100 people
50k+ population in a total metro of 100k
MSA
Urbanized area
50k population / block groups population density of 100k
Block group
1500 people; range between 300-3,000
Census tracts
4,000 people
Range between 1,000-8,000
Mean center population trend
1780-2010 population moving south/west
Gender shift
Women hold 1/2 of all jobs; 40% of businesses; 43% executives
Gombertz curve
S-curve
Assumes growth begins slowly, increases momentum until point of inflection then slows.
Ratio method (shift share) for populations
Assumes relationship between local area and larger area will remain constant
Cohort component method
Most common method
Change is a function of natural increase and net migration
* migration is least predictable
Location quotient
Total employment local industry / total local employment
Over
Total employment in national industry / US employment
I.e. retail employment / total employment
Township
6 x 6 mile square
36 sections
Section
1x1 mile squared
640 acres
Section
1x1 mile squared
640 acres
