FAQ # 33
ALL-WaysTM Support

How do proportional Impact Values work?

Many of the handicapping factors allow you to use proportional IVs. You can use proportional IVs by simply clicking the "PROPORTIONAL" box next to the factor name on the I V. input screen. When you do this, the middle IVs disappear, leaving only the highest IV and the lowest IV. Clicking "PROPORTIONAL" off restores all of the IV values

Here is an example of how proportional Impact Values work using the HALL Speed handicapping factor.

Ranking Scheme   1 st   2 nd   3 rd   Front   Rear  
Impact Value   1.8   1.5   1.3   1.0   0.6  

 

    HALL Speed     Rank     Absolute IV     Proportional IV      
                             
Horse A   116     1 st     1.8     1.80      
Horse B   115     2 nd     1.5     1.68      
Horse C   111     3 rd     1.3     1.20      
Horse D   110     Front     1.0     1.08      
Horse E   109     Rear     0.6     0.96      
Horse F   109     Rear     0.6     0.96      
Horse G   107     Rear     0.6     0.72      
Horse H   106     Rear     0.6     0.60      

In this example, horse B has a HALL figure very close to horse A and far superior to horse C. If proportional IVs are not used, horse B is assigned an IV closer to horse C than to horse A. Again, this is acceptable based on QUIRIN'S Study Of Impact Values. However, if proportional IVs are used, horse B receives an Impact Value much closer to horse A. Many handicappers will prefer this approach.

If you click "PROPORTIONAL" on, ALL-Ways will handle these calculations automatically,. All you need to do is assign the high and low Impact Values.

We recommend that you use proportional Impact Values whenever possible with a couple of exceptions. First, do not use them if you are creating Long Shot Profiles. Two, do not use them if you are creating profiles aimed at finding place and/or show horses. In both these cases we believe it is best to use calculated IV’s as is. Note that when you do use proportional IV’s, our experience shows the profile will not perform quite as well in the Database Run Analysis but it will be a more predictive profile for future races.

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