... but is the approach I used a reasonably sensible one in your opinion?

You have only described the manipulations you are doing to create your graph. Without some idea about what the raw data represents and what you are hoping to discover (or just show) with your graph, it is impossible to say whether your manipulations are good or not.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about question the status quo. Questioning authority".
The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.

In reply to Re^2: Problems processing data for graph by BrowserUk
in thread Problems processing data for graph by Angharad

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