[R] dplyr question

[Ragia Ibrahim]

Dear group,
I have the following data frame df
 
   Measure_id i j id value1           1 5 1  1   2.02           1 5 2  1   2.03           1 5 1  2   1.54           1 5 2  2   1.55           1 5 1  3   0.06           1 5 2  3   0.07           1 5 1  4   0.08           1 5 2  4   1.09           1 5 1  5   1.010          1 5 2  5   2.0..        ... . . ..   ...I want to add a probability column,  the prob column depends on id grouped by for each ithe rank will be current (value / max value ) for the same id for specific i, it would be
 Measure_id i j id value    prob1           1 5 1  1   2.0          2/2  2           1 5 2  1   2.0          2/2  3           1 5 1  2   1.5          1.5/1.5   4           1 5 2  2   1.5          1.5/1.5 5           1 5 1  3   0.0          06           1 5 2  3   0.0          07           1 5 1  4   0.0          0/1  8           1 5 2  4   1.0          1/1  9           1 5 1  5   1.0          1/210          1 5 2  5   2.0          2/3..        ... . . ..   ...
then I want to add a rank coulmn that rank regarding probability, if the probability equal they took the same rank for thesame id belongs to the same i, otherwize lower probability took higher rank for examole if we have three values for i=7 and for the three values the id is 1 and the probability is ( .2,.4,.5) the rank should be 3,2,1
replying  highly appreciatedRagia 		 	   		  
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