On Studybay, experts are ranked by clients on a 5 point scale. An average value is a decimal number and is used to form an average user rating. Rating of an expert indicates an objective evaluation of their performance and includes such factors as the time the project takes, the amount of time it takes for the expert to respond to the client, the number of refunds issued for their projects, and reviews given by clients. Each expert rating is recalculated daily and takes the last 150 completed projects into account.

There is a number of additional factors that may increase an expert's rating.

The following factors affect an expert's rating positively:

  • Positive reviews by clients
  • No delayed projects
  • No refunds issued for the projects
  • Confirmation of work halfway to deadline
  • A high percentage of confirmations when taking new projects

An expert's ratings and bids are the most important factors for the clients when deciding on their expert, so it’s very important for the experts to fulfill the projects on time and provide high-quality projects.

If an expert has less than 3 completed projects, they’ll have a “New Expert” tag. Their rating will be calculated and will become visible only when they complete 3 projects. In order to maintain the quality of our service, new experts have the following restrictions:

  • they’re unable to upload files to the projects in the auction, before starting their work on a project
  • they can’t work on more than 4 projects at the same time

Rating formulae

An expert's rating is calculated using the following formula:

If the result doesn’t fall into a range between 1 and 5, it gets a value of 1 or 5, whichever is closer to the result.

Rating calculation for the project i (xi):

First, a base rating xi is calculated. There are two possibilities:

  1. A client rated an expert’s completed project. In this case, the base rating xi equals the rating given by the client.
  2. The warranty period has expired, but the client didn’t rate an expert’s completed project. In this case, base rating xi equals 5 (by default).

Then, the rating may be modified by coefficients due to negative factors:

Late projects:

  • If the expert has 5% of delayed projects - the rating is lowered by an additional 0.1
  • 10% of delayed projects - the rating is lowered by an additional 0.2
  • 15% of delayed projects - the rating is lowered by an additional 0.3
  • 20% of delayed projects - the rating is lowered by an additional 0.4

Refunded projects:

  • If 2% of the projects are refunded - the rating is lowered by an additional 0.1
  • 4% - lowered by an additional 0.2
  • 6% - lowered by an additional 0.3
  • 8% - lowered by an additional 0.4
  • 10% - lowered by an additional 0.5
  • 12% - lowered by an additional 0.6
  • 14% - lowered by an additional 0.7
  • 16% - lowered by an additional 0.8
  • 18% - lowered by an additional 0.9
  • 20% - lowered by an additional 1.0

Confirmed projects:

  • 90% - lowered by an additional 0.1
  • 85% - lowered by an additional0.2
  • 80% - lowered by an additional0.3
  • 75% - lowered by an additional0.4
  • 70% - lowered by an additional 0.5

A complexity coefficient of the project i (i):

A complexity coefficient indicates the complexity of a completed project and is tied to project price. To prevent any abuse of the rating system, all projects priced less than $5 will have a complexity coefficient close to zero. The coefficient will then increase up to 0.9 for projects costing up to $40. The projects priced more than $150 are considered very complex and their complexity coefficient equals 1.5.

Additional factors that modify project complexity:

  • A user rating set by a client has more value than the rating set automatically (see rating calculation above). If the user rating for a project has been set automatically, for this project i=i*0.7
  • If an expert has completed a project marked as “premium”, for this project i=i*2

Additional positive and negative factors (nj and pm):

Additional positive and negative factors may be applied to a calculated rating if an expert often refuses to take new projects after bidding and being hired (more than 30%): minus 0.5;

Top Experts

On the ‘Expert Ratings’ page, the experts are separated by their field of specialization, based on general rating and the number of completed projects in a certain discipline or field. Each field has its separate top experts board. An expert’s position is calculated using the following formula:

An expert is positioned on the top expert board for a certain discipline if they have completed projects in that discipline or have set it as their field of specialization.

Experts tagged as “new experts” can also appear on this board if they have completed projects in that discipline. If an expert hasn’t indicated a certain discipline as their field of specialization and they have no completed projects in that discipline, this expert will not appear on the top expert's board for that discipline.

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