# STATs to learn Flashcards

statistics enables

informed decisions

first step of any medical stats

should be to get a clear understanding of the background info of the study and clarify objectives

second step of medical stats

formulate problem in statistical terms

how is diagnostic uncertainty qualified

using conditional probabilities

example of condition probabilities if the risk of having breast cancer is 1/10

- 9 probability that the lump is not cancer

0. 1 probability that the lump is cancer

RCTs require

active interventions by investigators

in observational studies, researchers play

a much more passive role

- treatment or exposure is not under control of the researcher due to ethical concerns of logistic complaints

observational studies are

cheaper and less time consuming then investigative studies

observational studies allows groups

which would often be excluded from clinical trials to be used

observational studies give a better estimate of

what actually happens in routine practice

i.e. patients in trials may be more compliant with treatment

a variable

is a set of characteristics which can be used to describe an aspect of a participant in a research study

the top of a bell curve shows

average- mean, median, mode

the width of a bell curve shows

variation

- sd
- iqr

histograms

shape of distribution , multiple modes, skewness and tail size

-outliers

box and whisker

compares location and variation in several groups e.g. outliers

scatter plot

dispels general form of relationships between 2 variables