Lab 6
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what are three requirements for infection to occur
a pathogen a susceptible host a conductive environment
pathogen population size affected by
factors within hosts and factors that affect how they move between hosts
what affects the speed of disease spread
rate of transmission, life history of pathogen, ecology and pop of host
size of disease pop inside host depends on
-availability of resources for growth -competition from other diseases -hosts immune response
distribution and rate of infection of disease can be described by
life history pathogenicity transmission rate host density
hantavirus
RNA virus resulting in pulmonary disease in humans. Vectored by deer mice and the disease ecology of hantavirus in humans is directly linked to ecology of the rodents
how to determine if twto factors are related to eachother
-if both variables respond to a common underlying cause, that is not directly causative -one variable causes direct changes in the other variable, direct cause and effect
responding to common underlying cause=
coorelation
one variable causes direct change in other variable
cause and effect
linear regression
used when already suspect a direct causative effect
how does linear regression work?
tries to draw a straight line that minimizes distance of each datapoint from that line –> called line of “best fit”
r^2
coefficient of determination
larger r^2(close to 1)=
very strong linear relationship
y=a+bx
y==independent variable x=independent variable a=y-intercept b=slope of line
LEARN TO DO A REGRESSION GRAPH
OK