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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,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");
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:
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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