how to splice a subarray from returned data component vuejs?

I have an object that is a list of arrays...

..this is a data declared in vue js from a prop:

    data: function(){
    return{
        listaSelezionati:this.selezionati
    }
}

..which is rendered on a v-for

<div class="row" style="margin-bottom:20px;" v-for="(selezionato,index) in listaSelezionati">

..inside this for loop there is a button who calls a function

<div class="remove pull-right" v-on:click="rimuovi(index)"></div>

..with this function I want to splice the sub array of object "listaSelezionati" using "index", but I'm not sure how to do it..

here what I have tried:

    methods:{
    rimuovi : function(index){
        alert(index);
        return{
            this.listaSelezionati[index][0].splice(index,1)
        }
    }
}

but it does nothing, anyone have something to suggest?

edit1 I want to know if return{this.listaSelezionati should be a right approach to edit a component data

If you want to remove an entire sub array by index all you need to do is this:

methods:{
  rimuovi : function(index){
    this.listaSelezionati.splice(index,1)
  }
}

There is no need to return a value; splice updates the array it is called on.