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Dear members, Thank you for your replies. I have been advised to group my data in intervals around the weights of my interest. Then I could assume these data to be representative of the distribution for the exact value (65kg, 70kg,...) from where calculating the percentiles. This would be the classical approach but I have found very few values around some of the points of interest. I wonder if I could use probability with these data, may be conditional or joint distributions to answer questions such as: Having a 80kg man, what would need to be his blood pressure for this man to be in the lowest 25% blood pressure group among the 80kg men? P((BP<=X inters W=80)/W=80)=0.25 ??? I would greatly appreciate any more suggestions. Thank you all for your replies. Best regards, Oscar. From: [log in to unmask] To: [log in to unmask] Subject: percentiles Date: Sat, 22 Jan 2011 11:36:39 +0000 Dear list members, I am trying to characterise descriptively the weight of a group of men with respect to their systolic blood pressure. An extract of the two variables can be seen below: Weight (kg) Blood P(mm)Hg 81.4 123 64.7 119 72.1 115 There are 1100 in total. I would like to make a table with percentiles for these groups of men from 65kg to 80kg by intervals of 5kg with respect to blood pressure. Example: Weight Percentile25 percentile50 percentile75 65kg 109mmHg 114mmHg 118mmHg 70kg 108mmHg 116mmHg 120mmHg 75kg 109mmHg 117mmHg 120mmHg 80kg 112mmHg 119mmHg 122mmHg My problem is that the weights are not in these same measures so I am not sure how this interpolation could be made. I would appreciate any suggestions about how to proceed. ------------------------------------------------------------------- This list is for discussion of modelling issues and the BUGS software. For help with crashes and error messages, first mail [log in to unmask] To mail the BUGS list, mail to [log in to unmask] Before mailing, please check the archive at www.jiscmail.ac.uk/lists/bugs.html Please do not mail attachments to the list. To leave the BUGS list, send LEAVE BUGS to [log in to unmask] If this fails, mail [log in to unmask], NOT the whole list