low dropout regulator output voltage
It's described on the datasheet here:



For Vout, use the voltage from the table you've quoted (which depends on the resistors). 

As you can see, the output voltage changes only slightly with input voltage until you closely (say within 0.25V or so, depending on output current) approach the dropout voltage. For voltages less than the dropout voltage it will tend to follow the input voltage down. No information is given as to what happens at very low input voltages.