Nominal distinct classes, no comparison ex: ethnic group, blood group Ordinal natural / meaningful order ex: tumour staging Continuous measurable variables ex : age, weight, height Discrete countable variables ex: no. of patients, no. of pregnancies

TYPES OF DATA

Numerical / Quantitative

Categorical / Qualitative

Figure / Chart

Figure / Chart

Histogram Boxplot

Frequency Polygon

Steam & Leaf Plot

Types

Types

Statistic

Statistic

Central tendency & Dispersion

- Mean & SD (if NORMALLY DISTRIB.)

- Median & IQR (if skewed)

Discrete

Bar Chart Pie Chart

- Frequency - Relative frequency - Cumulative

frequency

Ordinal

Nominal

Binary

Continuous