Hi ! Federball ! You are right: Formulas Revision is an excellent production !
Here is your formula:

Non Scoring Modified Tendex=
{[ Rebounds + 1.25*Assists + 1.25*Steals + Blocks - 1.25*Turnovers
   - Missed Field Goals - (Missed Free Throws /2) - Personal Fouls /2] / Minutes / Game Pace }

   Juan Jose Diaz - eBA Stats Team - The basketball Statistics Analysis

This post RESUMES the topic

We are going to summarize this topic, simultaneously with the other topics - see below, with a revision about the Tendex Rating, partially based on my Formulas Revision, at the Formulas section of the site..

About the Standard Tendex: This rating was developed by Dave Heeran during 30 years as a way to rate players by using statistics box scores.

Standard Tendex Rating=
{[ Points + Rebounds + Assists + Steals + Blocks - Turnovers - Missed Field Goals - Missed Free Throws ] / Minutes / Game Pace }

About the "Game Pace" factor: Pace factor is an estimate of the number of possessions per 48 or 40  minutes by a team and its opponents. It is calculated as follows:

Pace =  48 ( or 40 ) *  [ 0.44*(tmFTA + oppFTA) + tmFGA + oppFGA + tmTO + oppTO - tmORB - oppORB / 2 * tmMP ]
                                         
About the Modified Tendex= This rating was created by Jon Scot, from uk.fans.net and simply uses coefficients believed at Jon's time made more sense than using 1.0 for each measure as done above by Heeran.

Modified Tendex Rating=
 {[ Points + Rebounds + 1.25 * Assists + 1.25 * Steals + Blocks - 1.25 * Turnovers - Missed Field Goals - ( Missed Free Throws / 2 ) - Personal  Fouls / 2 ] / Minutes / Game Pace }

This modified rating is calculated with basis both on a "per minute" principle and a "per game" principle:
- the per game calculation loads more heavily towards players who play more minutes - from the fact they were chosen to play during the majority of the game - and therefore highlight their value to the team;
- the per minute calculation better brings out players who may play less minutes, but who are extremely productive while in game.

About the Non Scoring Modified Tendex= This rating is the same as above Modified Tendex, with the exception that points scored factor is completely removed. This system is useful to highlights a player who may not be a great scorer for their team, but contributes a lot on the another categories which are extremely important for team success.
On the second part, many players who are high-scorers on their team, but who do little else but shoot often appears very poorly in this rate. The great players, who in addition to a high score also contributes in the other categories, do very well in this rating.

Non-Scoring Modified Tendex Rating=
 {[ Rebounds + 1.25 * Assists + 1.25 * Steals + Blocks - 1.25 * Turnovers - Missed Field Goals - ( Missed Free Throws / 2 ) - Personal  Fouls / 2 ] / Minutes / Game Pace }

Commentary= This summary relates about only one version of this formulas. The complete version are detailed at my Formulas Revision.

About the eBA Tendex= The eBA Tendex Rating, in use by the eBA Statistics Creative Analysis System, developed by  Prof. Roberto Azar over the course of the last 18 years, is widely applied and referred at the eBA System. This summary in only another contribution to the large quantity of systems used in basketball today.

This summary resumes this topic and will be completed at the "Statistics" chapter of the eBA basketball Statistics Analysis System.  Another basketball statistics topics you'll find at the basketball Statistics Discussions section of our eBA Stats.com site.

    Debora Telmes - eBA Stats Team - The basketball Statistics Analysis