## maxima-lang-fr — French-language discussion of the Maxima computer algebra system

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 Re: [Maxima-lang-fr] [Maxima] Fwd: commandes statistiques From: Mario Rodriguez - 2009-11-30 16:09:37 ```> Bonjour. > > Je ne trouve pas de commande dans Maxima pour trouver la variance et > l’ecart-type d’une liste de valeurs accompagnée de la liste de > pondération, avec les options de sample et de population. Hello, Functions mean, var and std from package descriptive calculate the mean, variance and standard deviation directly from the sample, so that frequencies are obtained from data. Here is a simple example of a function that calculates the mean from two lists, observed values and frequencies: (%i4) display2d : false \$ (%i5) mean2(val, pon) := block([factor], factor : 1 / apply("+", pon), factor * apply("+", map("*", val, pon)) ) \$ If you work with absolute frequencies: (%i6) mean2([1, 2, 3], [4, 3, 5]); (%o6) 25/12 With relative frequencies: (%i7) mean2([1, 2, 3], [0.3, 0.3, 0.4]); (%o7) 2.1 A similar function could be written for the variance. -- Mario ```
 [Maxima-lang-fr] Fwd: commandes statistiques From: Robert Dodier - 2009-11-30 02:20:20 ```Hello, here is a message from maxima-lang-fr. Perhaps someone can respond? best, Robert Dodier ---------- Forwarded message ---------- From: Robert SETIF Date: 2009/11/29 Subject: [Maxima-lang-fr] commandes statistiques To: maxima-lang-fr@... Bonjour. Je ne trouve pas de commande dans Maxima pour trouver la variance et l’ecart-type d’une liste de valeurs accompagnée de la liste de pondération, avec les options de sample et de population. Merci et cordialement. ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now.  http://p.sf.net/sfu/bobj-july _______________________________________________ Maxima-lang-fr mailing list Maxima-lang-fr@... https://lists.sourceforge.net/lists/listinfo/maxima-lang-fr ```

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