Thanks for the links. Maybe I should have headed it with "for thick person" I found something similar but had a problem so I will try this tomorrow- too tired and frustrated now and it is late. Will let you know if it was an idiots guide for an idiot. Thanks for your help, do appreciate it and I may get my grades done to be able to make comparisons. Regards Sally
Mike I followed all the instructions from the site you suggested but came unstuck again when they did not match what I could see. The chart options were not the same as the instructions so as I am an idiot I got stuck, I don't really know enough about excel to be able to do anything but follow an idiot guide. I had generated a curve but then could not edit it properly around instruction point 29. Any help for an aged idiot? Thanks Sally
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