There is a critical missing type of chart in LibreOffice: pie of pie and related to it bar of a pie. This type of charts is presented in MS Office and is often necessary to show specific statistics.
Example of such chart in MS Office 2003 (is also present in newer versions):
http://office.microsoft.com/en-us/excel-help/creating-pie-of-pie-and-bar-of-pie-charts-HA001117937.aspx?CTT=5&origin=HA001034607

I am using Libre Office on Kubuntu and do not know, if this type of chart is presented in other versions of Libreoffice or in Openoffice.

I am writing my thesis and this type of chart is necessary for me, so I had to ask my friend to do it for me in MS Office. Such major functions are big barriers to use Libreoffice and Linux in general.

Thank you in advance!