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Pillow Ratings > Research Methodology
Our research findings are based on over 14,600 reviews / comments of actual pillow owners collected from diverse sources.
Online retailers such as Amazon, Overstock.com, Wal-Mart, Macy's and several others provide their customers with the ability to rate and review products that they purchased from them.
We have generally found the reviews on these websites to be credible and helpful.
In many cases, owner experiences collected from many message / discussion boards make up a significant part of our research data. Message boards are generally the best source for getting unbiased and authentic product reviews from actual owners. This is mainly because they tend to exist in near obscurity (most don't rank high in the search engines), are made up of a tight-knit group of people, and often have safeguards against suspicious contributors, such as someone who appears from nowhere to contribute to a product-related discussion.
In case if you don't know, message boards generally operate by someone posting a question and then others reply with answers. In this case, someone typically asks others what pillow they recommend or dont recommend. People then reply with their opinions often based on their own pillow ownership experience.
A small amount of our research data may come from product review websites, such as Epinions or Viewpoints. Generally, we regard these sources to be the least credible since virtually anyone can post a product review and are sometimes paid to do so. Consequently, we include into our data only those reviews that we regard as most credible.
On occasion, we include owner data from personal interviews that we conduct. While the number of these interviews is small, the amount and quality of owner information they provide is often excellent.
The sample size of at least 6,200 actual owner experiences is large enough in our opinion to provide accurate findings. We at Sleep Like The Dead are not expert statisticians, but we believe that our findings, especially for the satisfaction ratings, have a maximum margin of sampling error of ±4 percentage points. We believe this because no matter how much data (information from owner reviews / comments) we add to each pillow type or brand, our findings do not extend beyond a range of a few percentage points.
In addition, in most cases no one source makes up more than 20% of the total number of reviews / comments included in our data. This diversity of sources helps to ensure that you are getting as accurate and unbiased information as possible.
To further ensure accurate findings, several measures were taken. Namely, no data was collected from those who indicated that they have used a particular pillow for less than three nights since this is often not enough time to form a solid opinion one way or the other.
In addition, no data was collected from an owner review / comment that was older than six years. 90% of owner data is four years old or less.
Further, in cases where it was not clear if the reviewer owned the pillow, the review / comment were not included in the data. Owners were identified when they openly said they owned a particular pillow, referred to the pillow as my pillow or identified themselves as an actual owner in some other obvious, non-ambiguous way.
IN THE NEWS: Sleep Like The Dead's research findings have appeared in such news publications as Barron's • Toronto Star • St. Louis Post-Dispatch • Edmonton Journal • Woman's World • The Consumerist • The Gazette • Ottawa Citizen
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