PTE Academic Charts and Data Vocabulary

PTE Academic chart vocabulary is useful beyond Describe Image. Values, comparisons, distributions, and evidence boundaries also appear in lectures, summaries, reading passages, discussions, and essays. The goal is not to memorize a universal chart script. It is to state what the data supports and stop where the visual stops.

Use the PTE Academic vocabulary hub for the full route. For focused visual practice, continue to Lyra Practice’s PTE Describe Image guides.

Values, units, and denominators

Before choosing a trend verb, identify:

1. what is measured;
2. the unit;
3. the time period;
4. the population or denominator;
5. whether the value is a count, rate, percentage, or index.

Compare:

• 500 participants: a count;
• 50 percent of participants: a share;
• 50 participants per 1,000 residents: a rate;
• an index value of 50: value on a defined scale.

These cannot be substituted for one another.

Useful language:

• stood at 40 percent;
• accounted for one-third of the total;
• represented 600 cases;
• was measured in kilograms;
• per capita: per person in the relevant population;
• percentage point: absolute difference between percentages.

If a share rises from 40% to 50%, it rises by 10 percentage points, or by 25 percent relative to the initial share. Do not confuse the two.

Describing change

Match the word to the shape:

• edged up: small increase;
• rose steadily: consistent upward direction;
• surged: large, rapid increase;
• declined gradually;
• plunged: large, rapid decrease;
• fluctuated: moved up and down repeatedly;
• leveled off: became relatively stable after change;
• recovered: rose after decline;
• peaked at: reached the highest observed value;
• bottomed out at: reached the lowest observed value.

One rise is not a fluctuation. A high final point is not necessarily a peak if the series continues beyond the displayed period.

Original description:

“Output rose steadily from 2018 to 2021, dipped slightly the following year, and then recovered to its highest recorded level.”

This sentence preserves sequence and magnitude without inventing a cause.

Practice these boundaries with Lyra Practice’s trend guide.

Comparison and ranking

Useful structures:

• slightly higher than;
• roughly twice as high as;
• three times the value of;
• the largest/smallest share;
• ranked first/last among;
• exceeded X by an amount;
• the gap between categories;
• comparable to;
• remained below.

Be careful with multiplication:

“A was twice as high as B” means A was about two times B, not two times higher in every style guide’s interpretation.

A safer exact statement is:

“A was approximately double B.”

Use Lyra Practice’s bar-chart ranking guide and table guide.

Proportions and composition

• share/proportion of the total;
• majority/minority;
• combined share;
• made up/constituted;
• distributed across categories;
• accounted for nearly half;
• was evenly divided;
• was concentrated in one group.

Avoid calling 45% a majority. It may be the largest single category—a plurality or largest share—without exceeding half.

Example:

“Online sales accounted for the largest share at 45 percent, while stores and telephone orders represented 35 and 20 percent respectively.”

Practice proportions with Lyra Practice’s pie-chart guide.

Distributions and variability

Not every visual is a simple trend.

• range: distance between low and high values;
• median: middle value after ordering;
• mean: arithmetic average;
• cluster: concentration of observations;
• outlier: observation unusually distant from the rest under the context;
• spread/dispersion: degree of variation;
• skewed distribution: asymmetrical distribution;
• overlap: shared range between groups.

Do not call every high value an outlier. The word implies separation from the broader pattern, not merely being largest.

Example:

“Most values clustered between 20 and 30, while one observation near 60 was a clear outlier.”

The pattern supports the label because the gap is visible.

Correlation and causation

Data can show variables moving together without explaining why.

• positive association: values tend to increase together;
• negative association: one tends to decrease as the other increases;
• no clear relationship;
• correlates with;
• is associated with;
• may reflect;
• does not establish causation.

“Regions with more transit stops reported higher ridership.”

Possible causes include transit access, population density, policy, or reverse planning decisions. The chart alone may not distinguish them.

Unsupported:

“Adding stops will definitely make every resident use transit.”

The claim changes association, future prediction, and population scope.

Uncertainty and estimates

Visuals may include estimates or ranges.

• approximately/roughly;
• estimated at;
• between X and Y;
• confidence interval under the source’s definition;
• margin of error;
• variation around an estimate;
• the difference is small relative to uncertainty.

If two displayed ranges overlap, do not automatically say the groups are identical. If the source does not explain the statistical meaning, describe the visible overlap cautiously.

“The central estimates differ, although the uncertainty ranges overlap substantially.”

Processes and nonnumeric visuals

Data language also includes process diagrams and maps.

Process:

• initially, subsequently, after which, finally;
• is transferred, separated, heated, stored;
• results in, produces, is converted into.

Map or plan:

• adjacent to;
• along the northern boundary;
• was replaced by;
• expanded toward;
• remained unchanged.

Use Lyra Practice’s maps, processes, and photos guide to keep visual-type vocabulary separate.

Spoken delivery and selection

For a spoken image response, select a hierarchy:

identify → main pattern → two supporting comparisons → evidence limit

Example:

“The line chart compares monthly demand across one year. Demand generally rises toward midyear, peaks in July, and then declines, although December remains above the January level.”

This is more informative than reading twelve numbers. A template should not announce a “significant upward trend” before you inspect the graph.

Use PTE Describe Image practice in Lyra Practice to apply selection rather than memorized filler.

Transfer to summaries and essays

In source summaries, keep the relationship and limitation:

“The report identifies a gradual rise in remote enrollment, concentrated among part-time students, but does not determine why the groups differed.”

In essays, use data as limited support:

“A local increase may illustrate the potential benefit, but it does not establish that the policy will work in every region.”

Practice this boundary with Lyra Practice’s PTE summary claim-strength guide and essay causal-language guide.

Quick data check

Imagine a bar chart in which Group A rises from 40 to 50 and Group B rises from 20 to 35. Group A has the higher final value, but Group B has the larger absolute increase: 15 rather than 10. Group B also has the larger relative increase: 75 percent rather than 25 percent.

A precise overview could say: Both groups increased; A remained higher, while B grew more rapidly from its lower starting point. Do not call B the largest category or A the fastest-growing category. The correct comparison depends on whether the question concerns final level, absolute change, or relative change.

A Lyra Practice route

1. Start at the PTE Academic hub.
2. Practice trends, bars, pies, and tables in the dedicated Describe Image guides.
3. Use the mistakes guide to remove invented causes.
4. Complete the original Describe Image practice bank.
5. Transfer qualified data claims into summary and essay guides.

Keep an error log with unit, denominator, magnitude, comparison, cause, selection, and delivery.

Sources

• PTE Academic test format — Pearson

Related

• PTE Describe Image trends
• PTE bar-chart vocabulary
• PTE pie-chart vocabulary
• PTE table vocabulary
• PTE Describe Image mistakes

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