Charts & Graphs can only be shown for the whole collection (just Owned or also Ordered/Wish List is not quite clear).
Why not allow a filter, or just show results for flagged DVDs?

Other problem in Graphs is that all prices are added, for diverse currencies. One DVD paid in Yens shows up as a very expensive year...

Quoting Martin_Zuidervliet:

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Yes, I would rather like all foreign prices to be converted to the local currency.

Since conversion rates change, this wouldn't make much sense unless you do it at the time the purchase price is entered.

But why not enter them in your preferred currency from the start? You are the only one who knows what rate, for example, your CC company used and what conversion fee they charged you with.

Or did you talk about SRP?

Quoting Martin_Zuidervliet:

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Quoting goodguy:

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Or did you talk about SRP?

Yes, I did.

Bot the OP did not.

This would actually apply to SRP and actual prices.

My main concern was my first question though, to use charts & graphs on a selection. This modification would not actually require any user interface, since the current situation would be reflected by making no selection.

My thought exactly, that's why these issues are connected.

However, there can be many other reasons to use charts & graphs on a selection (if you use them at all), and the selection/flag system itself introduces a large flexibility automatically.