Index vs Absolute
AnalyticsAlso: Indexed Values vs Absolute Values · Indexed Reporting
Quick definition
An index is a number rescaled against a baseline so you can compare change over time or across groups, while an absolute value is the raw figure itself, like sales, clicks or dollars. Indexing turns raw counts into a comparable score, usually anchored to a baseline of 100, so relative movement becomes visible instead of buried inside noisy totals.
How it varies across Australia
Indexed reporting is common across Australian marketing dashboards, especially where benchmarks aggregate small samples across industries. The shape of the index matters more than the exact baseline chosen, and it varies widely depending on category and channel mix.
See how Australian teams benchmark performance →The two ways to report a number
The raw figure itself, like 1,200 sessions or 42 sales.
The same figure rescaled against a baseline, usually set to 100.
What it actually means
Picture two ways a runner can describe a race. One says 'I ran 100 metres in 12 seconds.' The other says 'I ran 8 percent faster than my personal best.' The first is an absolute value, a raw fact anyone can check. The second is an indexed value, a number rescaled against a baseline so improvement or decline becomes visible at a glance.
Marketing dashboards do the same trick. Traffic, revenue, conversion rate and CPA are all absolute values. Indexing rescales any of them against a chosen baseline, usually set to 100, so a jump to 115 means 15 percent above that baseline and a drop to 90 means 10 percent below it.
The appeal is comparability. An index lets you stack channels with wildly different scales, like email open rate and paid media spend, onto the same chart without one drowning out the other. It also lets you compare your own performance against an industry benchmark without revealing exact figures.
The cost is context. An index of 115 sounds identical whether the underlying absolute number moved from 10 to 11.5 or from 10,000 to 11,500. Without the absolute number sitting next to it, an index can flatter a tiny sample into looking like meaningful momentum.
An index tells you the direction of travel. It never tells you if you're travelling somewhere worth going.
How to calculate it
Index = (Current value ÷ Baseline value) x 100
Worked example. Baseline month conversion rate was 2 percent. This month it's 2.6 percent. Index = (2.6 ÷ 2) x 100 = 130. The index shows a 30 percent lift, but check the absolute number too. If baseline traffic was 50 sessions, that lift is only a handful of extra conversions.
The Australian context
Australian benchmark reports, including NR's own Atlas, lean on indexed reporting because the market is small enough that raw regional or industry totals can expose a competitor's actual figures. Indexing lets a report say a category improved without disclosing dollar spend or session counts.
It also helps when comparing an Australian business against overseas benchmarks that operate at a different scale entirely. A retailer with a fraction of an overseas competitor's traffic can still track its own indexed movement meaningfully. The trap is teams importing a global benchmark index and treating it as directly comparable, when the underlying absolute scale, seasonality and channel mix are nothing alike.
Where people get this wrong
Related terms
Common questions
Why use an index instead of just reporting the real number?
Indexing makes it easier to compare things that sit on very different scales, like email performance against paid media spend on one chart. It also protects sensitive absolute numbers when sharing benchmarks publicly.
What baseline should I use for an index?
Pick a period that represents normal performance, not a peak or a trough. A common choice is the average of the previous quarter or the same month last year. Whatever you choose, keep it fixed so later comparisons stay valid.
Can an index be misleading?
Yes. A big percentage move on a tiny absolute number looks the same as a big move on a huge one. Always show the underlying absolute value next to the index so readers can judge the real scale of the change.
Is index vs absolute the same as relative vs absolute?
Close enough for most conversations. Relative values, like percentage change, and indexed values both rescale a number against a reference point. Absolute values are the raw figures sitting behind both of them.
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About New Rebellion
New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
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