Creo q eso lo podrias hacer con javascript
Código HTML:
<html>
<head>
<title>Ayuda</title>
<script language='javascript'>
function fVerificarChecks(){
var content = document.getElementById("content");
var cadena = "Los resultados son:<br>";
var disponible = 0;
var no_disponible = 0;
for(var i=0;i<form1.radiobutton1.length;i++){
if(form1.radiobutton1[i].checked){
var posViviana = i;
if(form1.radiobutton1[i].value=="SI"){
disponible++;
}else if(form1.radiobutton1[i].value=="NO"){
no_disponible++;
}
break;
}
}
//----------
for(var i=0;i<form1.radiobutton2.length;i++){
if(form1.radiobutton2[i].checked){
var posEstefi = i;
if(form1.radiobutton2[i].value=="SI"){
disponible++;
}else if(form1.radiobutton2[i].value=="NO"){
no_disponible++;
}
break;
}
}
//----------
for(var i=0;i<form1.radiobutton3.length;i++){
if(form1.radiobutton3[i].checked){
var posRomy = i;
if(form1.radiobutton3[i].value=="SI"){
disponible++;
}else if(form1.radiobutton3[i].value=="NO"){
no_disponible++;
}
break;
}
}
//----------
if(disponible+no_disponible==3){
content.innerHTML = cadena;
content.innerHTML += disponible+" Disponibles<br>";
content.innerHTML += no_disponible+" no disponible<br><br>";
content.innerHTML += "Detalles:<br>";
content.innerHTML += "Viviana dice: "+form1.radiobutton1[posViviana].value+"<br>";
content.innerHTML += "Estefania dice: "+form1.radiobutton2[posEstefi].value+"<br>";
content.innerHTML += "Romy dice: "+form1.radiobutton3[posRomy].value;
}else alert("Debe seleccionar Una opcion Al menos");
;}
</script>
</head>
<body>
Se encuentra disponible estas personas:
<br> <br>
<form name="form1" method="post">
Viviana
<br> <br>
Si<input name="radiobutton1" type="radio" value="SI">
<br>
No<input name="radiobutton1" type="radio" value="NO">
<br> <br>
Estefania
<br> <br>
Si<input name="radiobutton2" type="radio" value="SI">
<br>
No<input name="radiobutton2" type="radio" value="NO">
<br> <br>
Romy
<br> <br>
Si<input name="radiobutton3" type="radio" value="SI">
<br>
No<input name="radiobutton3" type="radio" value="NO">
<br>
<p>
<input type="button" onclick='javascript:fVerificarChecks();' value="Calcular">
</p>
<div id='content'></div>
</body>
</html>