1 The median is the middle value of the data set. 2  The lower quartile (Q 1) is the median of the lower half of the data set. 3  The upper quartile (Q 3) is the median of the upper half of the data set. 4  The interquartile range (IQR) is the spread of the middle 50% of the data values.
Removable Essix retainers typically cost between $100-$250 for one or $200-$500 for two. They are made from a vacuum sealed clear plastic that is less noticeable but more likely to break or warp, meaning that you could be paying the price more than once for this style of retainer.
The retainer fee would be based on the support hour quantity chosen and my regular rate, less the discount, HiBeamR said. So, at a regular rate of $100 an hour, the retainers for Plans 1 and 2 would be $1,800 and $3,200, respectively.Any support in excess of the set quantity of hours would be at my regular rate..hen one IT consultant asked for advice about creating a retainer fee program at his firm, our members came through. Read their recommendations and warnings about this alternative to hourly fees.