excel - count blanks per row filtered on name -

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greeetings

i trying create formula in excel counting blank cells (that easy part ;))

but find number of blank cells per name in rowa. 

sheet1       b     1   *name*  *data*     2   brian   data1     3   niels   data1     4   kurt    data2     5   kurt         6   brian   data3     7   brian        8   niels   data2

should result in:

sheet2

      b 1   name    percent empty cells 2   brian   50% 3   niels   0% 4   kurt    50%

since 50 percent of brians fields empty. since 50 percent of kurts fields empty.

anyone?

to count empty cells, assuming f2 name value want up: 

=countifs(a:a,f2,b:b,"")

to percentage of empty cells:

=countifs(a:a,f2,b:b,"")/countif(a:a,f2)

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