Two problems...
1) If you want to dynamically manipulate questions, you cannot hide them with the advanced question setting - in that case, they are never rendered in the HTML so cannot be manipulated. If using version 2.5 or newer they can be hidden via CSS by adding a question class "hidden".
2) You forgot to add the final (empty) condition in your nested IF statements seen here with line-breaks inserted for clarity:
Here's a copy of your survey with those items fixed:
1) If you want to dynamically manipulate questions, you cannot hide them with the advanced question setting - in that case, they are never rendered in the HTML so cannot be manipulated. If using version 2.5 or newer they can be hidden via CSS by adding a question class "hidden".
2) You forgot to add the final (empty) condition in your nested IF statements seen here with line-breaks inserted for clarity:
SCREENC1=if(SCREENC.NAOK <= 18, "1",
if(SCREENC.NAOK < 25, "2",
if(SCREENC.NAOK < 29, "3",
if(SCREENC.NAOK < 34, "4",
if(SCREENC.NAOK < 44, "5",
if(SCREENC.NAOK < 49, "6",
if(SCREENC.NAOK < 54, "7",
if(SCREENC.NAOK > 55, "8",
""))))))))Here's a copy of your survey with those items fixed: