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Random sampling: stratified sampling
In an earlier post, we saw the definition, advantages and drawback of simple random sampling. Today, we’re going to take a look at stratified sampling. This method, which is a form of random ...
January 18, 2017 | Carlos Ochoa
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Random sampling: simple random sampling
Continuing with our series of posts on sampling, today we'll review the first random sampling method: simple random sampling. This is one of the most popular sampling methods, and it serves as a ...
January 16, 2017 | Carlos Ochoa
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Random and non-random sampling
In a recent post, we learned about sampling and the advantages it offers when we want to study a population. Today, we're going to take a look at the two main sampling methods. Let’s start by ...
January 12, 2017 | Carlos Ochoa
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Sampling: what it is and why it works
Whenever I look at the stats for this modest blog, I always notice the same pattern. The number of visits aligns perfectly with the Pareto principle: 20% of our posts generate 80% of our page views. ...
December 27, 2016 | Carlos Ochoa
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We need a fair measure of online panels size
The ISO26362 standard for access panels –thus applicable to online panels- was born with the purpose of providing research clients more clarity on how said data sources are created and managed. This ...
May 13, 2016 | Carlos Ochoa
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5 tips to recruit participants for online communities
In the field of Online Research Communities, projects do not usually surpass the 100 participants nor last over six months. In fact, most of our communities last less than 15 days and have on average ...
April 01, 2016 | Ferran Savín
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