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📋 Graph Types at a Glance

Graph Type	Best Used For	Key Limitation
Line graph	Change over time; continuous data	Not for discrete categories; implies smooth change between points
Bar chart	Comparing discrete categories	Does not show relationship between two variables
Histogram	Frequency distribution of grouped continuous data	Often confused with bar chart — x-axis must be continuous scale
Pie chart	Parts of a whole (proportions/percentages)	Hard to compare multiple sets; only shows proportions, not absolute values
Scatter graph	Correlation between two variables	Does not prove causation; line of best fit is a trend, not a prediction formula
Climate graph	Monthly temperature + precipitation together	Shows averages — hides year-to-year variation and extreme events
Population pyramid	Age-sex structure of a population	One point in time only; doesn't show change directly
Choropleth map	Spatial distribution of a variable across areas	Hides variation within areas; class boundaries create artificial "sharp" edges
Flow line map	Direction and volume of movement between places	Difficult to draw; arrows can overlap and obscure data

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