Dear Sir,
I have monitored and measured height of tree seedlings for three years and would like to analyse the data now. I have with me some missing data (dead trees) and I am confused what to do with these missing data. In addition, when I work out the increment, there are negative increment due to die back, insect attack and broken top.What do I do with these negative values ? I have no other statistical software but only Excell. Please I will very much appreciate your professional advice.

Thank you.

Fantine