{"id":6627,"date":"2025-07-15T13:34:48","date_gmt":"2025-07-15T13:34:48","guid":{"rendered":"https:\/\/functiontranslator.com\/estna\/"},"modified":"2021-02-26T08:09:00","modified_gmt":"2021-02-26T08:09:00","slug":"isna","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/fr\/isna\/","title":{"rendered":"ESTNA"},"content":{"rendered":"

La fonction ISNA (appel\u00e9e ESTNA dans les versions fran\u00e7aises d’Excel) sert \u00e0 identifier la pr\u00e9sence de l’erreur #N\/A, indiquant une valeur non disponible, dans une cellule. Cette fonction est essentielle pour traiter les donn\u00e9es absentes, souvent repr\u00e9sent\u00e9es par #N\/A, particuli\u00e8rement dans les analyses o\u00f9 certaines donn\u00e9es pourraient manquer.<\/p>\n

Syntaxe de la fonction<\/h2>\n

La syntaxe de la fonction ESTNA est la suivante dans Microsoft Excel :<\/p>\n

=ESTNA(valeur)<\/code><\/pre>\n
O\u00f9 valeur<\/em> est la r\u00e9f\u00e9rence de la cellule ou la formule \u00e0 examiner pour d\u00e9terminer si son r\u00e9sultat est #N\/A.<\/p>\n
Exemple :<\/p>\n
=ESTNA(A1)<\/code><\/pre>\n
Cette formule renvoie TRUE si la cellule A1 contient la valeur #N\/A, et FALSE dans le cas contraire.<\/p>\n
Applications pratiques<\/h2>\n
ESTNA est tr\u00e8s utile pour g\u00e9rer et pr\u00e9parer des jeux de donn\u00e9es comportant des entr\u00e9es incompl\u00e8tes.<\/p>\n
Exemple de probl\u00e8me 1 : Nettoyage des donn\u00e9es<\/h2>\n
Imaginez que vous disposez d’un tableau de donn\u00e9es de ventes avec certaines entr\u00e9es non disponibles, signal\u00e9es par #N\/A. Vous souhaitez d\u00e9nombrer les entr\u00e9es compl\u00e8tes.<\/p>\n
Solution :<\/p>\n
=NBVAL(A1:A100) - NB.SI(A1:A100; NA())<\/code><\/pre>\n
Ici, NBVAL(A1:A100)<\/code> compte les cellules non vides de A1 \u00e0 A100, et NB.SI(A1:A100; NA())<\/code> compte celles contenant #N\/A. Le r\u00e9sultat indique le nombre de cellules avec des donn\u00e9es valides.<\/p>\n
Exemple de probl\u00e8me 2 : Filtrage des donn\u00e9es pour analyse<\/h2>\n
Supposez que vous deviez analyser uniquement les donn\u00e9es valides d’un ensemble, en excluant les #N\/A pour \u00e9viter des erreurs de calcul.<\/p>\n
Solution :<\/p>\n
Pour calculer la moyenne des donn\u00e9es valides, utilisez :<\/p>\n
=MOYENNE.SI.ENS(A1:A100; A1:A100; \"<>\"&NA())<\/code><\/pre>\n
Cette formule calcule la moyenne des valeurs dans la plage A1:A100 mais exclut les cellules #N\/A, garantissant que seules des donn\u00e9es valides sont compt\u00e9es.<\/p>\n
Maitriser l\u2019utilisation de la fonction ESTNA peut donc grandement simplifier le traitement des ensembles de donn\u00e9es, en particulier ceux comportant de nombreuses valeurs non disponibles ou erron\u00e9es.<\/p>\n","protected":false},"excerpt":{"rendered":"
Renvoie VRAI si l\u2019aRgument valeuR fait R\u00e9f\u00e9Rence \u00e0 la valeuR d\u2019eRReuR #N\/A<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[319],"tags":[],"class_list":["post-6627","post","type-post","status-publish","format-standard","hentry","category-informations"],"acf":[],"yoast_head":"\nFonction ISNA (ESTNA) dans Excel : comment \u00e7a marche, exemples et syntaxe<\/title>\n<meta name=\"description\" content=\"Pr\u00e9sentation de la fonction ISNA (ESTNA) d\u2019Excel et Google Sheets. 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