Hi all, I am learning since couple of weeks the woderfull language for my sientific work (I allready tryed out apps like Mathematica etc.) . By now im facing with following problem. I use several packages like tseries and rmetrics. My main focus is working on minute financial data like sp500 and nasdaq. I can read data and mak some correct plots. But now i like to aggrigate the data by time. I tried to use time and frequency to make plots about values and time (e. g. plot the date over one day). Here a example of my standard minute data: TICKER,DATE,TIME,OPEN,HIGH,LOW,CLOSE ND,01/02/1997,08:30:00,821.36,821.36,821.36,821.36 ND,01/02/1997,08:30:00,824.55,824.55,824.55,824.55 ND,01/02/1997,08:30:00,824.67,824.67,824.67,824.67 ND,01/02/1997,08:30:00,825.27,825.27,825.27,825.27 ND,01/02/1997,08:31:00,824.80,824.80,824.80,824.80 ND,01/02/1997,08:31:00,825.51,825.51,825.51,825.51 ND,01/02/1997,08:31:00,825.08,825.08,825.08,825.08 ND,01/02/1997,08:31:00,824.80,824.80,824.80,824.80 ND,01/02/1997,08:32:00,825.46,825.46,825.46,825.46 Can someone help me to handle the time in my code to plot over differents time periode (one day, one month etc.) Thnaks in advance for your hints! cheers -- View this message in context: nabble.com/Aggrigate-time-in-financial-data-tp19501759p19501759.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]]