respartner_filter/view/partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="view_res_partnerfilter_search1" model="ir.ui.view">
            <field name="name">res.partner.filter.search1</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_res_partner_filter" />
            <field name="arch" type="xml">
              <search>
                  <group string="Agrupar por">
                      <filter string="Masculino" name="sexo" domain="[('sexo','=','masculino')]"/>
                      <filter string="Femenino" name="sexo" domain="[('sexo','=','femenino')]"/>
                      <filter string="Por dia" context="{'group_by':'create_date:day'}"/>
                  </group>
               </search>
            </field>
        </record>

    </data>
</openerp>