UPDATE This morning i visited Google.de to be surprised by a new interactive doodle for (which I think) is Google's official 12th birthday. It consists of multiple, colored, bouncing but time-wasting spheres. It has also been seen on Google.co.uk ......

Adage.com has gotten hold of an internal Google search spending document which gives a partial overview of how much money the big brands are spending on Adwords. Depending on your view, there may be some surprises here, especially how much BP spen......

According to the Google Webmaster Blog, Google is now indexing .SVG, (Scalable Vector Graphics) presented as an alternative to Flash. But who besides wikipedia actually uses .SVG? In my view, .SVG is akin to Flash when used in content - what ......

BRUSSELS, 1 September 2010 – Search and web analytics agency Semetis today announced the launch of a new interactive marketing concept, a premiere on the Belgian market....

Google today announced they are changing the rules on how their partner agencies are to be working with AdWords accounts/advertisers. In order to combat non-transparency in Google AdWords account management, Google will force agencies to report al......

Brussels, Tuesday 20 July 2010 - David Gillain, Agency Manager at Google Belgium launched today an appeal to all Belgian Search agencies looking for volunteers in the framework of the local Belgian Google Grants program managed by Olivier Z......

Rolf Broer, who works at Onetomarket, just released a very interesting article about Googlebot and its crawling capabilities. Rolf created several tests for the so called superior bot of Google to see how it reacts on particular setups of links an......

One of the latest happenings in the online hemisphere which is still causing lots of controversy is the recent change in the directive of the European Union’s Privacy & Telecommunications Law. This new European Law actually says th......

Today is the third time I have heard concrete stories of false & misleading pitches from a particular web agency in Belgium. The company promises prospects first position on Google with enhanced sponsored links through a commercial deal with G......

Come and have a look at the summary of the second edition of the Search University event that took place in Brussels on Friday 28 May 2010 at the prestigious Méridien Hotel. Search University has become the meeting place for European and Be......

Here's a very GEEK post on a simple piece of information you will find nowhere on Google Help Pages. Yet, this is very useful for all SEA specialists out there. We have published this list of Google AdWords Shortcuts on Semetis Website a couple of......

Ik vond vanmiddag toevallig een tooltje die ik ooit gemaakt had op basis van Google's eigen Website Optimizer Duurcalculator. Waarom had ik die tool gemaakt? Omdat de tool van Google zelf in mijn ogen niet voldoet. Wat kun je dan met die tool? Berekenen hoe lang een A/B of multivariate test ongeveer gaat duren voor er statistisch significante resultaten zijn.

Google's Tool

De tool van google ziet er als volgt uit:

De eerste 4 velden zijn prima in te vullen. Je kiest een aantal combinaties, je zoekt het aantal pageviews op die je normaal op de te testen pagina haalt. Je wil 100% van het bezoek in het experiment en je succespercentage zoek je op in je Analytics pakket, dit percentage is afhankelijk van het doel van je test.

Maar dan het laatste vakje: de verwachte verbetering. Tja, weetikveel? De klant wil 50%, ik denk dat 5% al mooi is, en de waarheid zal er tussen liggen. Maar op basis van het aantal dagen dat een test zal duren kies je vaak ook het aantal varianten dat je wil testen. Hoe meer varianten je in een korte tijd kunt testen hoe meer je uit de test haalt. Extra leesvoer: hoe lang moet een test duren. Maar zonder een goede inschatting van de te verwachten verbetering weet je niet hoe lang een test duurt.

André's testduur calculator

En daarom heb ik onderstaande tool gemaakt. Je vult de bekende velden in, en in de tabel wordt dan het aantal dagen getoond dat nodig is voor een significant resultaat. Door nu te spelen met de waardes zie je ook direct het effect op de periode. Je kunt beter zien in welke periode een bepaalde verbetering te halen is: hoe meer groen, hoe beter het is. Je kunt beter inschatten welk aantal varianten haalbaar is: bij veel verbetering snel resultaat en bij minder verbetering toch nog altijd binnen een paar weken.

Vul de velden in:

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