How to count the number of combination of rows with a drop down list selection in datatables

I would like to count the number of rows in a table after making a selection in a drop down list (Name). but the only problem here is i would like to count number of rows basing on an other attribute in my table (position).
for example:
if i make a selection in the Name: Tiger Nixon
i would like to get
total rows: 3
Position 1 : 1 rows Position 2 : 1 rows Position 3 : 1 rows

Here the code I use to make a drop down list selection with attribute (Name) and it worked perfectly.

$(document).ready(function () {
$('#example').DataTable({
initComplete: function () {
this.api().columns(0).every(function () {
var column = this;
var select = $('<select class="Search"><option value=""></option></select>')
.appendTo($(column.header()))
.on('change', function () {
var val = $.fn.dataTable.util.escapeRegex(
$(this).val()
);
column
.search(val ? '^' + val + '$' : '', true, false)
.draw();
});
column.data().unique().sort().each(function (d, j) {
select.append('<option value="' + d + '">' + d + '</option>')
});
});
}
});

$('.Search').change(function () {
if ($("#example > tbody > tr > td").length == 1) {
$('#Count').empty();

$('#Count').append('Count: 0' );;
} else {
$('#Count').empty();
$('#Count').append('Count: ' + $("#example > tbody > tr").length);
}
});
});


this pict for counting number of rows using just selection on Name

$('#table_id').DataTable().page.info().recordsDisplay

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