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...table" to obtain a frequency table from a numeric sample vector.  The idea is to calculate mean and standard deviation on grouped data.  However, I can't extract the midpoints of the class intervals, which seem to be strings treated as factors.  How do i extract the midpoint? Thanks, jose loreto [[alternative HTML version deleted]]

...2.13.0 the first one would have been used.) So it appears to be an issue of the pre or post 2.13 version being used.  However, i don't see how the above code has more than one unamed element and thus how this error is produced.  Can anyone enlighten me on this error? Thanks in advance, josé loreto romero palma [[alternative HTML version deleted]]

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...I would like to plot a grey shaded region approximately corresponding to the dispersion cloud, in order to appreciate homocedasticity or the lack thereof.  Perhaps this could be done by calculating "upper and lower limit trend lines"? Any ideas on how to do this? Thanks in advance, José Loreto Romero Palma [[alternative HTML version deleted]]

I need to do text mining on PDF files. I understand there is a readPDF command in tm that can be used. Have read the 2008 posts on converting PDF files to text by Tony Breyal and others. Wondering if the procedure has been standardized in any tutorial or otherwise? Being new to R, I was able to follow only part of the discussion. Any way to get a set of step by step instructions

...relevant strings (Wouter Bolsterle, Bastien Nocera) - Updated ca: Gil Forcada - Updated ar: Ignacio Casal Quinteiro, Djihed Afifi - Updated cs: Petr Kovar - Updated et: Priit Laes - Updated gl: Ignacio Casal Quinteiro - Updated es: Jorge Gonzalez - Updated nl: Wouter Bolsterlee - Updated pt: Duarte Loreto - Updated nb: Kjartan Maraas - Updated tr: Baris Cicek - Updated pa: Amanpreet Singh Alam - Updated th: Theppitak Karoonboonyanan - Updated zh_TW: Taiwan - Updated pt_BR: Jonh Wendell - Updated pl: Artur Flinta - Updated fr: Claude Paroz - Updated zh_HK: Hong Kong - Updated de: Andre Klapper, Hendr...