hi thierry
thanks for your reply
yes, you are right, your solution is more straightforward
best
Da: "Thierry Onkelinx" <thierry.onkel...@inbo.be>
A: "Massimo Bressan" <massimo.bres...@arpa.veneto.it>
Cc: "r-help" <r-help@r-project.org>
Inviato: Giovedì, 9 novembre 2017 15:17:31
Oggetto: Re: [R] weighted average grouped by variables
Dear Massimo,
It seems straightforward to use weighted.mean() in a dplyr context
library(dplyr)
mydf %>%
group_by(date_time, type) %>%
summarise(vel = weighted.mean(speed, n_vehicles))
Best regards,
ir. Thierry Onkelinx
Statisticus / Statistician
Vlaamse Overheid / Government of Flanders
INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
FOREST
Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance
thierry.onkel...@inbo.be
Kliniekstraat 25, B-1070 Brussel
www.inbo.be
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