Ne sait pas

L'utilisation ou non de la modalité est un enjeu pour le chercheur, car sa présence dans le questionnaire peut inciter les personnes questionnées à renoncer à des réponses utiles qu'elles feraient effectivement en son absence. D'un autre côté, ne pas y recourir, c'est risquer d'obtenir de nombreuses réponses faites sans conviction de nature à introduire un biais statistique dans les résultats finaux. En outre, cela ne permet pas une distinction entre les enquêtés qui admettraient positivement ne pas savoir répondre et ceux qui sauteraient la question sans pour autant pouvoir l'admettre, ce qui serait donc une non-réponse. Dans le cadre d'un sondage d'opinion politique, par exemple, cela revient à risquer de confondre des électeurs susceptibles de recourir au vote blanc et des abstentionnistes potentiels.

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