probability from different values

one addition ...
  

Hello Ricardo,

another solution could be using package distr:

library(distr)
A <- c(18,18,18,19,20,21,22,23,24,25,26,27,28)
DA <- DiscreteDistribution(A)
# maybe
# support(DA)
# plot (DA)

B <- c(82,83,84,85,85,86,87,88,89,90,91,91,92)
DB <- DiscreteDistribution(B)
# support(DB)
# plot(DB)

DC <- DB - DA# convolution with of DB with (-DA)
# support(DC)
# plot(DC)
  
    

to get the probabilities for the C-values:
p(DC)(support(DC))
  

hth,
Matthias

Richard.Cotton at hsl.gov.uk wrote:
  
    

i have two vectors (A and B) and i need create another vector (C) 
from the subtraction of A's values with the B's values. How can i 
estimate the probability of C's values if i have differents values 
combinations of A and B that can result in the same value? like 90 
-20 = 70 and 91 - 21 = 70.

example:
B = {18      18    18     19      20      21      22      23      24
25      26      27   28....} 
A = {82     83     84     85      85     86       87     88       89
90      91     91    92 ....}
    
      
        

Try this:
A = c(18,18,18,19,20,21,22,23,24,25,26,27,28)
B = c(82,83,84,85,85,86,87,88,89,90,91,91,92)
lenA = length(A)
lenB = length(B)
AA = rep(A, lenB)
BB = rep(B, each=lenA)
table(AA-BB)/(lenA*lenB)

Regards,
Richie.

Mathematical Sciences Unit
HSL


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