Let\'s say I have different text values in a column such as:
(source: sartodimoda.com)
I want a formula to calculate the frequency of every tex
As @Kabir said in the comments, you could use a pivot table. You could also use the COUNTIF function. Try putting the following formula in cell E1 and dragging it downward so the other cells in column D.
COUNTIF
=COUNTIF(A:A,D1)