This PropertyComparison engine is used to compare two SwissProt objects.
(For more details how a SwissProt object is structured please check the details entry in the Input section!)
All entries of each property contained in the SwissProt objects are compared to calculate absolute and relative frequencies as well as ratios of these fequencies between the two SwissProt objects.
absolute frequency:
Specifies the number of occurrences of a property entry in its SwissProt object.
relative frequency:
Specifies the number of occurrences of a property entry in its SwissProt object, relative to the total amount of entries of this property.
absolute ratio:
The ratio is calculated by dividing the smaller absolute frequency value of a property entry by the greater absolute frequency value.
The result is a value between 0 and 1 wich describes the similarity of the occurrence of this property entry between the two SwissProt objects.
The closer to 1 the more similar the property is.
The amount of appearences of this property entry is equal in both sets, if the value equals 1.
The closer to 0 the more dissimilar.
If the absolute frequency value of one property entry of an SwissProt object equals 0, the absolute ratio is set to -Infinity to express maximum frequency difference.
relative ratio:
The calculation equals that of the absolute ratio but instead of absolute frequency values, relative frequencies are used.
The closer to 1 the more similar the property is.
The amount of appearences of this property entry is equal in both sets, if the value equals 1.
The closer to 0 the more dissimilar.
log ratio:
The log ratio value is calculated by logarithmizing the relative ratio.
The closer to 0 the more similar.
The amount of appearences of this property entry is equal in both SwissProt objects, if the value equals 0.
The closer to -Infinity (greater negative number) the more dissimilar.