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Hi Jeff - Thanks for the interaction. I'd like
to get this working myself as you can tell. And I stand
corrected >= should be >,
although that's not a bad metric to have a EPS
staying flat or increasing. CANSLIM just tests to see if it's
>=1.
I've got a version of the CYIE but I'll
have to check the definition again because I have >= again and have
to verify the numbers.
Others that need work are %EPSChange (and you
cannot use QP's number because it's static, at least not on my part since I
want to
back test some of this. AND 1YrEPSGrowth.
So if we look at what would be arrays there would be CQIE, CYIE,
%EPSChange, 1YrEPSGrowth,
%Cl/52Hi, and RS Rank....Float and
%Inst could be tossed in to see if they made a difference but all you'd be
getting is the last value.
How are you verifying the numbers with
QP? Did you build a view for the CANSLIM picks?
Best regards
JOE
----- Original Message -----
Sent: Wednesday, March 22, 2006 3:32
PM
Subject: Re: [amibroker] Re: Single Value
from Array
Hi Joe,
The problem with keying off the months is that it returns a lot of
incorrect data (1,000 on average). The only way I can explain this is that
companies just don't report very consistently. I chose to key off a change
(not necessarily greater than) either the Sales or the EPS because I figured
one of those would have to change in order to constitute a new report. Since
EPS is such a small number, a change there probably won't register (.02 is
pretty much the same as .024). By using Sales in addition to EPS I was able to
return the correct data (according to SPP) of all but 11 stocks.
I like your idea for figuring CQIE in a loop (my previous solution was
nested IIF statements). Unfortunately, I can't get it to work. I believe the
count is increasing whenever one quarter EPS is less than the following
quarter's EPS (your code actually has less than or equal to, but I changed
that part). The problem is this is not consecutive quarters of increasing EPS;
it's merely consecutive two quarters of increasing EPS. From SPP:
"The most recent quarter is compared to the preceding quarter. If the most
recent quarter is greater than the preceding quarter (not equal), the count is
increased by one. This type of
backwards comparison where each quarterly EPS is compared to the previous
quarterly EPS goes on until one of two events occur:
-
All 8 quarterly time periods have been processed or
-
The security fails with a quarter that doesn't increase, the process
will stop and the count is recorded
The counting process results in a number from 0 – 7. A security with
consecutive upward progress will get a value of 7 (8 quarters of steady upward
progress). A
security with a zero means the current quarter is less than the previous
quarter."
In effect, the loop needs another way out - when the change in EPS from i
to i+1 is either 0 or less than 0. CQIE needs to stop counting as soon as
EPSi<=EPSi+1. I've tried a couple different methods, and still am. Any
suggestions?
Thanks!
Jeff
Joe Landry <jelandry@xxxxxxxxxxxxx>
wrote:
Hi Jerrry - I take it you're trying to calculate
the Continuous Quarterly Increase in Earnings. CQIE
I added a few things to the code and
I think this is right altho and I didn't look up the definition this
morning or compare it
to the QP database for the specific stocks I
ran.
This is one place where I would use a loop..
Either that or repeat the statement 7 times for the 7 quarterly comparisons.
Note that I use the "event" or conditon that it is
the change of quarter based on the date (the month that is) and not
whether
EPS was greater than the month before to trigger
the comparisons, AND if the comparison or the condition is TRUE then I
count it as a quarterly increase.
You could also put the EPS1 thru EPS9 in a loop
also, as well as the column statements. It would save a little writing but
this works.
Glad you picked up on the use of ValueWhen....a
powerful function.
Best regards
JOE
// Run an Explore against a watchlist with "n last days = 1" for one
bar
EPS = GetExtraData("EPS");
Sales= GetExtraData("Sales");
Cond1 = ( Month()-1)%3
==0;
Cond2 = Month()!= Ref(Month(),-1);
Quarter = Cond1 AND Cond2;
Change = quarter; // I left this in here since you
had it imbedded in each of the EPS0 ...EPS9
//C hange=((Sales != Ref( Sales, -1 )) OR (EPS !=
Ref(EPS,-1)));//When does either the Sales or the EPS change
//Set the EPS values for each occurence of a change in either Sales or
EPS.
CQIE = 0; // Initialize the accumulator for
the CQIE
for (i=1; i<= 7; i++)
{
CQIE = CQIE + IIf(ValueWhen(quarter,EPS,i)>=ValueWhen(quarter,Ref(EPS,-1),i),1,0);
_TRACE ("CQIE =
"+CQIE +
" Index
"+i);
}
_TRACE ("CQIE
outside loop "+CQIE);
// CQTot = CQIE + CQ2;
EPS0= Ref(EPS,-1);
EPS0 = ValueWhen(Change,EPS,1);
EPS1 = ValueWhen(Change,EPS,2);
EPS2 = ValueWhen(Change,EPS,3);
EPS3 = ValueWhen(Change,EPS,4);
EPS4 = ValueWhen(! Change,E
PS,5);
EPS5 = ValueWhen(Change,EPS,6);
EPS6 = ValueWhen(Change,EPS,7);
EPS7 = ValueWhen(Change,EPS,8);
EPS8 = ValueWhen(Change,EPS,9);
EPS9 = ValueWhen(Change,EPS,10);
AddColumn (EPS0,"EPS0");
AddColumn (EPS1,"EPS1");
AddColumn (EPS2,"!
EPS2");
AddColumn (EPS3,"EPS3");
AddColumn (EPS4,"EPS4");
AddColumn (EPS5,"EPS5");
AddColumn (EPS6,"EPS6");
AddColumn (EPS7,"EPS7");
AddColumn (EPS8,"EPS8");
AddColumn (EPS9,"EPS9");
AddColumn (CQIE,"CQIE");
Filter= 1;
----- Original Message -----
Sent: Wednesday, March 22, 2006 2:15
AM
Subject: Re: [amibroker] Re: Single
Value from Array
Hi Joe,
I may have it. I liked your code, but my objective is to run a
Canslim type of exploration/scan. But your code did turn me on to the
ValueWhen() function. Coupling that with a simple check of Sales today
against Sales of yesterday, or EPS today against EPS yesterday, puts me in
a place where no more than 11 of the stocks AB returns vary more than .01
in any one quarter from the data reported by SPP. No more than 70 (or so)
vary by a penny in any one quarter; which seems to be a rounding error.
(SPP seems to round down when dealing with fractions of a penny.) For not
knowing how SPP is arriving at its data, nor when the quarters end, I
think that's pretty good. I don't know why these stocks show up, but I'll
keep looking into it. In the mean time, I think we can use this to
determine quarterly EPS and Sales growth.
I really do appreciate all the effort you've put into educating me.
Perhaps you wouldn't mind spending a few more minutes and looking over my
code?
EPS = GetExtraData("EPS");
Sales= GetExtraData("Sales");
Change=((Sales != Ref( Sales, -1 )) OR (EPS != Ref(EPS,-1)));//When
does either the Sales or the EPS change
//Set the EPS values for each occurence of a change in either Sales
or EPS.
EPS0= Ref(EPS,-1);
EPS1 = ValueWhen(Change,EPS,2);
EPS2 = ValueWhen(Change,EPS,3);
EPS3 = ValueWhen(Change,EPS,4);
EPS4 = ValueWhen(Change,EPS,5);
EPS5 = ValueWhen(Change,EPS,6);
EPS6 = ValueWhen(Change,EPS,7);
EPS7 = ValueWhen(Change,EPS,8);
EPS8 = ValueWhen(Change,EPS,9);
EPS9 = ValueWhen(Change,EPS,10);
AddColumn (EPS0,"EPS0");
AddColumn (EPS1,"EPS1");
AddColumn (EPS2,"! EPS2");
AddColumn (EPS3,"EPS3");
AddColumn (EPS4,"EPS4");
AddColumn (EPS5,"EPS5");
AddColumn (EPS6,"EPS6");
AddColumn (EPS7,"EPS7");
AddColumn (EPS8,"EPS8");
AddColumn (EPS9,"EPS9");
Filter= 1;
Joe Landry
<jelandry@xxxxxxxxxxxxx> wrote:
Cato
cc: Quotes Plus Users:
< /FONT>
I'm thinking you probably don't !
need to apply iterative loops to get what you want. I also wanted
to say
that there are only 4 arrays available
from QP via the functions Tomasz wrote in Amibroker. They are QRS,
EPSRank, EPS,
and Sales. I'm checking but not
sure other arrays are available to Amibroker's plug in.
QRS is calculated daily, EPSRank is done
weekly, EPS and Sales are reported quarterly. So these arrays,
if
you run an explore, will change only on
the dates(bar) that the quarter changes.
The other values are point values. What
you get when you call a GetExtraData for example for PEG,
is
the last calculated PEG for that stock.
You can't go get it's historical value nor use PEG as a
backtesting
criteria.
Here's a small routine that does not use
loops and presents the EPS at change of quarter on an
Exploration.
BTW, I would encourage the use of
Explorations in the AA mode, especially if you're not using "for" loops.
Hope this helps.
JOE
// Exploration for Quarterly EPS - For example, run on single
issue over 1000 bars.
EPS = GetExtraData("EPS" );
Sales = GetExtraData("Sales");
QRS = GetExtraData("QRS");
EPSRank = GetExtraData("EPSRank");
// Bruce Robinson wrote this originally as a one line program but I
split it so it
// be more readable by me and others who are starting out.
Cond1 = (( Month() - 1 ) % 3 == 0 ); //
Remainder when prev month number is div'ed by
3.
// Do an
explore on Cond1 and see what it does.
Cond2 = Month() != Ref(
Month(),-1);
// Cond2 to set 1
when month changes.
QTR = IIf(Cond1 AND Cond2,1,0);
Filter = 1; //QTR; // //
to print only quarterly results, uncomment the use of QTR.
AddColumn (Close,"Close" );
AddColumn (EPS,"EPS");
AddColumn (Sales,"Sales");
QuarterlyEPS = ValueWhen(QTR,EPS); // this is not needed the way I have the filter set
up.
AddColumn (QuarterlyEPS,"QE
EPS");
AddColumn (QRS,"QRS");
AddColumn (EPSRank,"EPSRank");
AddColumn (GetExtraData("PEG"),"PEG
Ratio"!
);
----- Original Message -----
Sent: Tuesday, March 21, 2006
1:28 AM
Subject: RE: [amibroker] Re:
Single Value from Array
Terry,
I want to thank you for the time you put into educating me. I
learned a lot. I rewrote my code using what you taught me and
everything worked out as it should. It was much faster, and much
cleaner. Unfortunately, I haven't thought this through enough. It's
looking more and more like what I want to do will simply not be
possible. The code returns different values from the array, but
several vary from what QP3's own software is telling me the earnings
should be; even on the last earnings reported (which should be
barcount-0). It gets worse the farther back in time I go. I'll have to
study the problem some more. At least I learned a lot about loops and
arrays!
Cato
Terry <MagicTH@xxxxxxxxxxx>
wrote:
Cato,
Almost.
EPS is an
array. AB let's you access individual array elements, called bars
(bar = day in a daily database), with [brackets]. So, EPS[i]
is just one of the
days in the database for the symbol in use. You were correct in your
original assumption on that count. What you're missing is the
necessity of breaking those out into separate elements since EPS
already contains the values you want. Maybe an example is in
order:
Buy = C
> 10 AND ESP > 20; //A simple example that buys if Price is
> $10 and EPS > 20
A
backtest evaluates each bar (or the range of bars you select as
dates to test) and it knows on each day (bar) what the values are.
The EPS will change quarterly as it should. You don't really need to
do anything special to make this happen.
-----Original
Message-----
From:
amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx]
On Behalf Of Jeff
Springer
Sent:
Monday, March 20, 2006 18:49
To:
amibroker@xxxxxxxxxxxxxxx
Subject: RE: [amibroker] Re:
Single Value from Array
Thank you for your excellent reply. I think
you pegged me right on. I was under the impression that the []
subscript referenced only a single number from that array.
But you're telling me that EPS[x] is an array as well,
albeit an array with the same number repeated for however many
bars. So, if I can rephrase what you wrote, I don't need EPSx,
I just need EPS with the various values for i to pull the number I
want to manipulate out? I can understand that, and see that what I
really need is to discover the values for "i" at each change. Do I
understand you correctly?
If so, do you have any recommendations for
discovering the values for "i"? Would it be much like your first
post? I imagine I would use different variables for each occurrence
of a change, but I probably shouldn't start assuming
again.
Again, your reply was very clear and
clarifies a lot of questions I had. Thank you,
again.
Cato
Terry
<MagicTH@xxxxxxxxxxx>
wrote:
I don't have QP3 so I can't get too
specific, but I think you ha! ve a bas ic misunderstanding on how
Amibroker is supposed to work. It's very common for people with
coding experience to want AB to work with single values. If I'm
way off on understanding your issue, my
apologies!
AB is an array processing system. For
example, you shouldn't mix arrays and single values as you have
done in your Do loop. You have assigned a single value to an array
with EPS0 = EPS[b-1]. So, you have assigned the same value to the
entire EPS0 array. This array is the same size array as the
ticker you are working with. Now you have 4 arrays, all barcount
long, with the same value in each one. I think you are thinking
you have an array that is one-quarter long (about 66 days), but it
is not. Besides, you already have all the data in the original EPS
array and it's already arranged by quarter. In abbreviated form
you have this:
EPS
11111111111111122222222222222233333333333333334444444444444444
EPS0
11111111111111111111111111111111111111111111111111111111111111
EPS1
22222222222222222222222222222222222222222222222222222222222222
EPS2
33333333333333333333333333333333333333333333333333333333333333
EPS3
44444444444444444444444444444444444444444444444444444444444444
You need to get comfortable with data
being in arrays and each bar simply represents the status "as of
that bar". It really works well this way. Your EPS has a value
everyday. If it doesn't change for an entire quarter, you simply
have the same value everyday. Then, on the day it changes, you'll
have the new value for the next 66 days. On any given day you can
simply refer to your EPS or Sales array and you will have the
correct value. AB "knows" which day you are "on". Same answer for
your original question about Ref(). It does refer to a single
value -x bars in the past, it's just an array of single references
so on any given day, the array "knows" the answer -x bars
previously.
Again, sorry if I am explaining something
you already know.
Thank you very much for replying, Terry.
That's pretty much what I discovered over the weekend. Would you
mind looking at my response to Bill Barnard and providing your
input?
Terry
<MagicTH@xxxxxxxxxxx> wrote:
Try this:
i = 0; //Start at beginning of
array
do i++; while
(myArray[i-1] == myArray[i])
//After this line executes, the value of i =
the first changed array
element.
--
-----Original
Message-----
From:
amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx]
On Behalf Of Jeff
Springer
Sent:
Monday, March 20, 2006 10:35
To:
amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] Re:
Single Value from Array
I've figured it out, but have run into a
new problem. I'm trying to get the history of EPS and Sales from
the QP3 data, which are arrays. I didn't want to be this specific
because I realize others don't have QP3 and I wanted to phrase my
question in general terms that I think would work with all arrays.
I think if you run this code on any array you should come up with
the same error I got. Would you mind looking at it and giving your
input?
while (EPS1==EPS0 AND
i<b);
while (((EPS2==EPS0) OR (EPS2==EPS1)) AND
i<b);
while (((EPS3==EPS2) OR (EPS3==EPS1) OR (EPS3==EPS0)) AND i<b);
There's more, but you can see the general
pattern from these three. The EPS array is set up so that each bar for a
quarter has the same EPS value. When a new EPS comes out, the EPS changes
(ideally; since I'll only be looking at stocks where EPS increases, I
don't care if the code mistakes a new EPS for an unchanged EPS). I step
back through the array to search for a different
EPS.
This code works
fine, but I would prefer that "i" continues counting up rather than
reseting (as I've done with the "i=1;" line before each do loop). The
problem with this is that the do loop checks the condition /after/ running
the "EPSx=EPS[b-i];" line. So, when it hits a stock with few bars, the
code errors out with the "outside 0... (barcount-1) range" error. Is there
a way to put a conditional statement in before the "EPSx=EPS[b-1];" line
so that if "i" is greater than the barcount, then EPSx is null, or
0?
I've tried changing the "EPSx=EPS[b-i];" line to
"EPSx=iif(i>b, 0, EPS[b-i];" but that still errors out. Maybe there's
something more basic I'm missing.
Thank you, for your
help.
Cato
Bill Barnard
<wbarnard@xxxxxxx>
wrote:
--- In amibroker@xxxxxxxxxxxxxxx, Jeff Springer
<fatboycato@xxx> wrote:
>
>
Thank you so much for replying, Bill, but I don't think that
will
work for me. I was hoping
to use the code in an exploration, and I
think this code will only give me the data in a
debugger window,
correct? I
tried assigning the _Trace calls to variables, and
then
displaying that variable
with AddColumn, but of course that doesn't
work. I'm too programming ignorant to know
why.
>
> It seems to
me that if Ref() calls up a specific value in the
array, then it shouldn't be returning an array, just
that specific
value. I'm sure
there's a good reason why it doesn't work this way,
I
only wish I had some way of
calling up a value from an array and
assigning that value, and only that value, to a
variable.
---------------------------------------------
You are welcome. sorry it isn't what you
need.
Ref() does produce
an array, the original one shifted by a certain
amount.
If you can
describe what you are trying to do, very exactly,
in
English, I am sure the code
would not be too difficult.
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