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It looks to me like you are trying create Advance/Decline for DJI index. Why not use existing data?
As far as Volume, I use Volume Zone Oscillator (described in IFTA 2009 journal - www.ifta.org)
R = IIf(C > Ref(C,-1), V, -V); //store +V on UP day or -V Volume on DOWN day in R variable array.
Then the ratio of R/V defines the oscillator.
You can use the same concept to compute positive volume (on up day) and negative volume on down day)
I hope this helps.
Regards
Richard
--- In amibroker@xxxxxxxxxxxxxxx, "triangle702000" <jkra70@xxx> wrote:
>
> I think OBV would give me the trend of pos. to neg. volume, but I'm looking for the % of negative vol.
>
> I read a study which found a connection between days where 90%+ of the vol. and pts. on the Dow were neg., followed closely by days where 80%+ of vol. and pts were positive could indicate a change in the primary trend. I'd like to track this in the form of a indicator. OBV would tell me if the trend of pos. vol. is excelerating or not, but I like to see an actual number. Thanks. -jim
>
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>
> --- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic" <fimdot@> wrote:
> >
> > Why not keep things simple and use OBV()?
> >
> > Bill
> > ----- Original Message -----
> > From: triangle702000
> > To: amibroker@xxxxxxxxxxxxxxx
> > Sent: March 14, 2009 8:00 PM
> > Subject: [amibroker] indicator- % of vol that is negative
> >
> >
> > Hey everyone. I've been working on building an indicator and have been unable to get it to work.I've been using AB mostly for charting ,explorations,etc,and have only built a couple of very simple indicators up to this point,so I'm having a bit of a hard time with this and am hoping someone can point me in the right direction.
> >
> > Basically, I'd like to look at the Dow and find what % of the volume at the end of each day is negative and what % of the point change is negative and plot it as a line on a 0-100 scale.(it would look similar to an RSI).
> >
> > Each day,the indicator would tally up all of the negative point changes,and all the positive changes and find what % of the points were negative.It would also do the same for the vol.
> >
> > For example, pnp=tnp/(tpp+tnp)* 100; represents ,"the % of neg. points = total neg. pts / (total positive pts + total neg. points)*100"
> >
> > I'd would do the same for the volume and plot each line seperately on the same graph.
> >
> > I started by assigning each symbol in the Dow a variable,
> > v_aa=Foreign("AA","V",1); (for the volume)
> > p_aa=Foreign("AA","C",1); (for the points)
> >
> > I then used IIF to find which stocks closed lower than yesterday and assigned it a variable depending on whether it was positive or negative.
> > np_aa= IIf (p_aa<Ref(p_aa,-1),Ref(p_aa,-1) - p_aa, 0);
> >
> > " /*if todays close is < yesterdays close,subtract todays close from yesterdays and assign it the varible "np_aa", else nothing*/"
> >
> > ..and again for positive close.
> > pp_aa= IIf (p_aa<Ref(p_aa,-1),0,p_aa-Ref(p_aa,-1) );
> >
> > "/*if todays close is < yesterdays close,do nothing, else subtract yesterdays close from todays and assign it the varible "pp_aa"*/ "
> >
> > So now I have a two lists of Dow stocks that have closed up for the day, closed down,and I add each list up to come up with a total of up points and a total of down points.
> >
> > /* find total up points. tpp="total positive points"*/
> >
> > tpp =(pp_aa+ pp_axp+ pp_ba+ pp_bac+ pp_c+ pp_cat+ pp_cvx+ pp_dd+ pp_dis+ pp_ge+ pp_gm+ pp_hd+ pp_hpq+ pp_ibm+ pp_intc+
> > pp_jnj+ pp_jpm+ pp_kft+ pp_ko+ pp_mcd+ pp_mmm+ pp_mrk+ pp_msft+ pp_pfe+ pp_pg+ pp_t+ pp_utx+ pp_vz+ pp_wmt+ pp_xom);
> >
> > /* find total down points. tnp="total negative points"*/
> >
> > tnp=(np_aa+ np_axp+ np_ba+ np_bac+ np_c+ np_cat+ np_cvx+ np_dd+ np_dis+ np_ge+ np_gm+ np_hd+ np_hpq+ np_ibm+ np_intc+
> > np_jnj+ np_jpm+ np_kft+ np_ko+ np_mcd+ np_mmm+ np_mrk+ np_msft+ np_pfe+ np_pg+ np_t+ np_utx+ np_vz+ np_wmt+ np_xom);
> >
> > I use the same method for finding the up and down volume.
> >
> > Then I find the % of the total points that is negative..
> >
> > /* find the percentage of negative points. pnp="percentage of neg.points"*/
> >
> > pnp=tnp/(tpp+tnp)* 100;
> >
> > Again I do the same for the volume.
> >
> > Now I have two seperate values that I want to plot on the same graph with a 0-100 scale,which I tried do this way...
> >
> > SetChartOptions(0,0,chartGrid10|chartGrid90);
> > Plot(pnp,"% of neg. pts.",colorYellow);
> > Plot(pnv,"% of neg. vol.",colorBlue);
> >
> > First,the header,or title (I'm not sure of the correct term) lists the stock which is displayed in the chart above the indicator.I thought using the foreign function would allow me to plot an indicator based on data other than the symbol that is being currently displayed.
> >
> > Also I have no data showing up in the indicator window. It says "empty" for both vol. and points.
> >
> > Sorry for the long post,I just wanted to give enough info.I hope I've been clear enough for people to have an idea what I'm trying to do.I'm sure I'm making this a lot more complicated than it needs to be,but like I said I'm still trying to get the hang of programming.If anyone could give me a few pointers and a nudge in the right direction it would be greatly appreciated. Thanks . -jim
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> >
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