How to calculate PAPR and why to plot PAPR with CCDF

[kashifrao]

I wrote my code OFDM system, now I want to calculate PAPR of my OFDM system for kk = 1:nsym

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Code dot - [expand]
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peakpwer_ofdm(kk) = max(abs(ser_data(nsym,:)).^2);
% average power
 averagepower_ofdm(kk) = mean(abs(ser_data(nsym,:)).^2) ;
% PAPR
 PAPR_ofdm(kk) = peakpwer_ofdm/averagepower_ofdm ;
end

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I use this code for PAPR calculation, Is it right ?
and why we plot CCDF vs PAPR? can anybody help me.
Best Regards
Kashif