Level 2 Level 4
Level 3

Theme 3 - Critical Numbers


28 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Ignore?
Nominal Variables
Assigned to a category with no natural ordering e.g. hair colour
Ordinal Variables
Categories which are ordered e.g. level of satisfaction
Discrete Variables
only takes whole numerical values e.g. number of people
Continuous Variables
Variables have no limitation on values e.g. weight
Histograms
visually display frequency distribution of continuous variables
Standard Deviation
a quantity expressing by how much the members of a group differ from the mean value for the group
Epidemiological triad
the time place and person
Incidence
the number of new cases in a period/population
Prevalence
how many people have a disease amongst a population at a specific point in time
Person-time
way of determining how many people at risk
Case fatality rate
number of people who die from the disease in a period/number of people with disease in period
Mortality rate
number of people who die from disease in period/number of people who die in period
Types of Studies
Check my I+P Memrise
Risk
number of new cases/number at risk
Odds of an event
probability of event/probability that event does not occur
Odds ratio
the measure that is calculated to represent the relative risk for a case-control study
Relative Risk
used with Cohort studies only
RR = 1
no benefit or harm
RR less than 1
exposure is protective
RR more than 1
exposure is harmful
Mean
summarise a normally distributed variable
Median
summarise an abnormally distributed variable
IQ range
used with median, measure of spread
Confidence intervals
measure accuracy
T test
determine whether the means of two different groups are statistically significant from one another
P value
the probability of obtaining the results given that the null hypothesis is true
Correlation less than 0.7
treat with suspicion
Chi squared test
goodness of fit