1. Foundational Definitions
Foundations I
Foundational Definitions

2. Foundational Items ndividual - items that are observed I V P
ariable - characteristic of the individuals observed
opulation - all of the individuals of interest
arameter - summary (numerical or graphical) of the variable for the population
ample - portion of population actually examined
tatistic - summary of the variable for the individuals in the sample
IVPPSS

3. Example IVPPSS
215 rabbit (Oryctolagus cuniculus L.) carcasses were examined for signs of myxomatosis1 on Bridgets Farm (Hampshire, southern England) during a period when the density of fleas2 had been substantially reduced with an insecticide. Primary interest was in the proportion of carcasses that exhibited signs of myxomatosis.3
1A disease causing drastic declines in wild rabbit populations
2The primary vector for the myxomatosis disease
3Trout et al. (J. Appl. Ecol :79-686)
IVPPSS

4. Example IVPPSS
215 rabbit (Oryctolagus cuniculus L.) carcasses were examined for signs of myxomatosis1 on Bridgets Farm (Hampshire, southern England) during a period when the density of fleas2 had been substantially reduced with an insecticide. Primary interest was in the proportion of carcasses that exhibited signs of myxomatosis.3
I --
a rabbit carcass (on Bridgets Farm during the treatment period)
V --
Signs of myxomatosis (Y/N)
IVPPSS

5. Example IVPPSS
215 rabbit (Oryctolagus cuniculus L.) carcasses were examined for signs of myxomatosis1 on Bridgets Farm (Hampshire, southern England) during a period when the density of fleas2 had been substantially reduced with an insecticide. Primary interest was in the proportion of carcasses that exhibited signs of myxomatosis.3
P --
all rabbit carcasses (on Bridgets Farm during the treatment period)
P --
Proportion of all rabbit carcasses (on …) that showed signs of myxomatosis
IVPPSS

6. Example IVPPSS S -- 215 rabbit carcasses actually examined S --
215 rabbit (Oryctolagus cuniculus L.) carcasses were examined for signs of myxomatosis1 on Bridgets Farm (Hampshire, southern England) during a period when the density of fleas2 had been substantially reduced with an insecticide. Primary interest was in the proportion of carcasses that exhibited signs of myxomatosis.3
S --
215 rabbit carcasses actually examined
S --
Proportion of 215 rabbit carcasses (on …) examined that showed signs of myxomatosis
IVPPSS

7. Important Relationships
What describes this relationship?
Summarization
Parameter
Population
Statistic
Sample
Representation or
Estimation
Parameter
Population
Statistic
Sample
IVPPSS