How We Gather (and How to Interpret) Our Data
Our tables rating individual companies will be more valuable to you if you know how the data were gathered and how they should be interpreted.
We regularly survey area Consumers' Checkbook and Consumer Reports subscribers for their feedback on services they have used. We sometimes also survey subscribers to various other websites and publications and survey a sampling of other area consumers. On our surveys, we ask consumers to rate their experiences with companies they had most recently used on several aspects of service. Our ratings tables show the percent of each company's surveyed customers who provided a rating of "superior" (as opposed to "inferior" or "adequate" ) for questions on our survey. We sometimes also report the percent of surveyed customers who rated each company "adequate" or "superior" (as opposed to "inferior" ) for the "overall quality" question on our survey.
We have included on our ratings tables all of the companies for which we received at least 10 ratings on our customer surveys. If a company is not listed on our ratings tables, it simply means we did not receive at least 10 ratings for it.
Since many companies were rated by rather small numbers of raters, small differences between two firms in the percentage of raters who gave a particular rating (say, "superior" ) should be ignored. The table below gives a rough guide to minimum differences you should look for in deciding on one company over another.
When using these survey data, remember that the questions are to some degree subjective and that the differences among companies might be explained by differences in the personalities, backgrounds, critical standards, and other characteristics of the raters or by biases these raters might have.
For many of the services we evaluate, our ratings tables show the number of complaints filed against each company with the Better Business Bureau for a three-year period.
When using the complaint information, keep in mind that complaints are not always justified; sometimes the customer is unreasonable. Another problem is that we didn't have a measure of business volume and therefore couldn't control for differences in companies' exposure to complaints.
We always recommend that you look for substantial differences in complaint counts. We also advise giving little weight to complaint counts if the total count against a company is less than three or four.
Timeliness of the Data
All of the data must be interpreted in view of timeliness. Our customer survey data are from surveys conducted from January 2007 to December 2017. Survey respondents were asked to report on experiences in the preceding year. Our data on complaints for the Better Business Bureau are for a three-year period dating back from a date in March or April 2015. Our price data were collected from November 2014 to March 2015. The data from our surveys of companies were collected from November 2014 to March 2015.
For the most part, our tables include companies for which we collected 10 or more ratings on our customer survey during the customer survey period mentioned above, but we do not report data for periods prior to companies' changes of name and ownership. As a result, some large companies are not listed at all. If only name or ownership changed, we do report the data. Changes subsequent to the dates listed above may not be taken into account.
We give checkmarks to companies that score highest on a scoring system that we devise for each service field. Our scoring systems weight the various data in our tables and text based on our subjective judgment of their importance. Since the scores are based entirely on information presented, you can apply your own subjective judgments, and decide whether you prefer companies we have not given checkmarks. Where we do not have important data on a company, we cannot give our checkmark.