ICCs represent mathematical functions of the relationship between positioning on the latent trait continuum and the probability of giving a particular response. Figure 3 illustrates this relationship as a logistic function. Individuals lower on the latent trait or with less ability have a lower probability of getting a correct response or endorsing an item, especially as difficulty increases. Thus, those higher on the latent trait or in ability have a greater chance of a correct response or endorsing an item. For instance, on a depression inventory, highly depressed individuals would have a greater probability of endorsing an item than individuals with lower depression. Similarly, individuals with higher math ability have a greater probability of getting a math item correct than those with lesser ability. Another critical aspect of ICCs pertains to the inflection point. This is the point on the curve where the probability of a particular response is .5 and also represents the maximum value for the slope. This inflection point indicates where the probability of a correct response or endorsing an item becomes greater than 50%, except when a "c" parameter is greater than 0 which then places the inflection point at 1 + c/2 (a description will follow below). The inflection point is determined by the difficulty of the item which corresponds to values on the ability or latent trait continuum. Therefore, for an easy item, this inflection point may be lower on the ability continuum while for a difficult item it may be higher on the same scale.