Formula does not apply to the column

[#1]

I have this table, and I want the average of the column EC(mS/cm) on the column next to it, group by name.

I used this formula yesterday but today it does not work when I apply it to the column.

If( Row() == Col Min( As Column( "EC (mS/cm)" ) << By( :Name ) ),

Col Mean( As Column( "EC (mS/cm)" ) << By( :Name ) ),

.

)

Thank you in advance!

[#2]

If(Row() == Col Min("EC (mS/cm)"n, :Name),
	Col Mean("EC (mS/cm)"n, :Name)
);

[#3]

It does not apply the formula

[#4]

Is your formula supressed?

[#5]

I used this one and it worked: 

If(

   Row() == Col Min( Row(), :Name ),

       Col Mean( :"EC (mS/cm)", :Name ),

   .

)