I have an index variable that I created meant to measure the sophistication of different military aircraft based on their speed, range, etc. The variable is bounded between 0 and 1 inclusive; it cannot take values greater than one or less than zero. However, it is not a fraction in the traditional sense since it's not measuring a proportion or percentage of something. Would tobit (setting the lower limit to 0 and the upper limit to 1) or fractional regression be more appropriate in this case?

Thanks!