Ch. 4 Supplement Flashcards
The delcining Intensit of an activity with increasing distance from its point of origin
Disntance Decay
A poin on a scatter diagram that is roughly in line with the main trend but it separated from the main group of points because of its extremely high or low value- contrast with outlier
Extreme Value
A model to predict spatial interaction where size (population) is directly related to interaction and distance is inversely related to interaction
Gravity Model
A permanent change is residence to outside one’ community of origin
Migration
Migration that runs opposite to a migration stream
Migration Counterstream
The tendency for certain types of people to migrate. Age, education, and other sociodemographic characteristics are migration selectivity factors
Migration Selectiviy
A well-defined migration channel from a specific origin to a particular destination
Migration Stream
The percentage gain or loss of popluation due to migration. It is calculated as in-migrants minus out-migrants divided by the total population, all times . Positive numbers indicate net gain; negative numbers indicate net loss
Net Migration Raate
Point on a scatter diagram that lies far off the trend line. Outliers on the graph correspond to cases that are poorly predicted by the model. Outliers are not to be confused with extreme values, which may lie far from any other point but which are still close to the best-fitting line
Outlier
Reasons to move to a particular place
Pull Factor
Reasons to move from a particular place
Push Factor
The difference between an actual observed value of some variable and its predicted value using the gravity model
Residuals
A scatter of dots showing the relationship between two variables. Eah dot on the graph represents between two variables. Each dot on the graph rebresents the x and y coordintes ofa differennt observation or case
Scatter Diagram
Movements of ideas, information, money, products, and people between places
Spatial Interaction
