Mutual fund prices precision

[Edward Doolittle]

If I recall the number of decimals is set in two different places: Tools ->
Security Editor -> (select security) -> Edit -> Fraction Traded, and in the
account, e.g., Investments -> Brokerage -> MutualFund -> Edit Account ->
Smallest Fraction. The setting of Smallest Fraction should (almost?) always
be "Use Commodity Value", in which case it takes the smallest fraction from
the Fraction Traded variable of the security editor.

I had some incorrect values in Smallest Fraction for some accounts, and it
caused a phenomenon similar to what you describe, if I recall.

Edward

On 1 August 2015 at 20:56, AC <gnucash at acarver.net> wrote:

> The accounts are all set to six decimals right now but the displayed
> number of decimals is only 3 in places like the balance.  If there's
> some very subtle rounding errors or truncation errors I'm not able to
> see them.
>
> On 2015-08-01 19:14, David T. wrote:
> > AC,
> >
> > My experience doesn’t match yours; if I fill out the shares and purchase
> price, the price is set by GnuCash, and the shares stay accurate—as others
> have described.
> >
> > Is it possible that your account is set to 2 decimal places? That would
> explain the rounding you describe.
> >
> > David
> >
> >> On Aug 1, 2015, at 8:08 PM, AC <gnucash at acarver.net> wrote:
> >>
> >> On 2015-08-01 16:37, farleykj wrote:
> >>> I tried this out, via the following, pretty much as you described:
> >>> (1) enter 47.889 shares in that column.
> >>> (2) enter 4.76 in the price column
> >>> Make no other entries, <tab> through to the next line of the split.
> >>> The result is the total is calculated as 227.95. This results in the
> price
> >>> per share being adjusted to the 4.75997 value. The number of shares is
> >>> unchanged. Thus I don't understand what you mean by the final share
> count
> >>> being off.
> >>> I suspect what's happening is because the registers are only allowing
> the
> >>> balance column to represent numbers with two decimal places, since
> we're
> >>> dealing with dollars and cents. It calculates the total to be 47.889 *
> 4.76
> >>> = 227.95164, rounds that to 227.95, then recalculates the price to be
> >>> 4.75997.
> >>
> >> Somewhere it's causing the shares or the balance of the account to be
> >> off slightly.  My balances are showing three decimal places currently
> >> and I've even set the accounts to have six decimal places with no
> >> apparent change.  This account is off by about one whole point whereas
> >> the other fund accounts differ from the statement by 0.01 or so.  The
> >> others have fewer transactions than this one so it seems to be a
> >> cumulative effect.  The balance column doesn't line up with any of the
> >> statements over time, it's slowly drifting apart.
> >>
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-- 
Edward Doolittle
Associate Professor of Mathematics
First Nations University of Canada
1 First Nations Way, Regina SK S4S 7K2

« Toutes les fois que je donne une place vacante, je fais cent mécontents
et un ingrat. »
-- Louis XIV, dans Voltaire, Le Siècle de Louis XIV, Chap. XXVI