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...with albumin levels greater than 33 (y). What command function do I use (assuming that I will be using the chi square test) to show that the length of stay in hospital of those in group x is statistically significantly different from those in group y? I look forward to your thoughts. Ivo Gwanmesia [[alternative HTML version deleted]]

Dear Sir, How do I change the intervals on the x axis of a histogram plot; let us say for example the intervals were 0,5,10,15,and 20, and I wanted to change the intervals to 0,2,4,6,8,10,12,14,16,18,20. I look forward to receiving your words of wisdom. Ivo [[alternative HTML version deleted]]

Dear Sir, Just started using R. I want to plot x>-1:20, for example, in the colour blue. How do I do this? Regards, Ivo [[alternative HTML version deleted]]