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Statistical significance explained without any maths
What the number actually claims, what it doesn't, and the four sentences you need to read a result honestly without ever computing anything.
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Ideas to make every visit convert better
Practical guides on experimentation, personalization, statistics and AI agents, written by the team that builds Bixlow and runs CRO programs every week.
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More than two variants: when an A/B/C actually makes sense
Adding a third variant costs you a third of your sample and buys you a comparison you may not need. Three cases where it's worth it, and one very common case where it isn't.
3 min read
Traffic allocation: when to use 50/50 and when to use 90/10
An even split gets you the fastest answer. An uneven one limits how many customers see a change you're not sure about. You can't have both.
3 min read
Variant persistence: why a visitor must always see the same version
If someone sees variant B on Tuesday and variant A on Friday, you haven't run an experiment. You've run a bug that also produces numbers.
3 min read
Mutually exclusive tests: stopping two experiments from contaminating each other
Two experiments on the same funnel produce four combinations and one confused conclusion. Mutual exclusion is how you keep the answer readable.
3 min read
Supertargeting: combining country, device, source and behaviour
Stacking conditions makes the segment sharper and the sample smaller. Here's how to know when the trade is worth it — and when you've segmented yourself into noise.
3 min read
Targeting by UTM: every campaign should land on the page it promised
You wrote a specific ad and then sent the click to a generic page. Message match is the cheapest conversion lift available to a small brand, and UTM targeting is how you get it.
3 min read
Mobile, desktop and tablet: segmenting by device without duplicating work
Responsive design made one page serve every screen. It didn't make one experiment serve every screen — and most flat results are a mobile win cancelling a desktop loss.
3 min read
New vs returning visitors: two websites inside the same website
A first-time visitor needs to be convinced. A returning one needs to be let through. Showing both the same page is the most common unforced error in CRO.
3 min read
Geographic targeting: why the same test doesn't work in two countries
Shipping expectations, payment habits, price sensitivity and trust signals vary by market. Averaging across them is how you get neutral results that hide real effects.
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