Hi,
For simplicity, suppose I’m working with a time series having data in two columns.
The first column contains weekly dates(D) whereas the second column contains value (V) for each corresponding date.
I’m trying to construct an indicator(I) based the value of the date and value(V) and the lag value of itself lag(1)( I)
Therefore, for each date, it’s look for the value of V and the lag(1)(I) and based on certain conditions assign a value to (I).
I have 14 conditions as listed below. I have also attached in Excel the time series and expected value of I.
I tried to write the codes but unfortunately it’s not working.
I just starting using Eviews , any help will be greatly appreciated.
My working file is as follows:
'Open working file
wfcreate(wf=QuestionLoop, page=week) w 19991008 @now
'Import data from Excel
import U:\echangeu\DEVISES\Backtesting\Sudesh\Eviews\DataLoop.xlsx range=Data colhead=1 namepos=first na="#N/A" @freq W 19991008 @smpl @all
'Code for the signal
for {code}
series temp = @recode(V}<>na,@trend,na)+1
scalar first = @min(temp)
scalar last = @max(temp)
firstdate=@otod(first)
lastdate=@otod(last)
smpl {firstdate} {lastdate}
series I = 0
' (1) if V >= 2 then signal = 1
SMPL IF V >=2
series I =1
' (2) if V lies between 1.5 and 2 and signal(1) > 1 then 0.5
SMPL IF V<2 and V>=1.5 and and I(1)> 1
series I = 0.5
' (3) if V lies between 1.5 and 2 and signal(1) = 1 then 1
SMPL IF V<2 and V>=1.5 and I(1)= 1
series I = 1
' (4) if V lies between 0.5 and 1.5 and signal(1)=1 then signal = 1
SMPL IF V<1.5 and V>0.5 and I(1)=1
series I = 1
' (5) if V lies between 0.5 and 1.5 and signal(1)= 0.5 then signal = 0.5
SMPL IF V<1.5 and V>0.5 and I(1)=0.5
series I = 0.5
' (6) if V lies between 0.5 and 1.5 and signal(1)>= 0 then signal = 0.5
SMPL IF V<1.5 and V>0.5 and I(1)>=0
series I = 0.5
' (7) if V lies between 0.5 and 0.5
SMPL IF V<0.5 and V>0.5
series I = 0
' (8) if V lies between 1.5 and 0.5 and signal(1)=1 then signal = 1
SMPL IF V>1.5 and V<0.5 and I(1)=1
series I = 1
' (9) if V lies between 1.5 and 0.5 and signal(1)= 0.5 then signal =0.5
SMPL IF V>1.5 and V<0.5 and I(1)=0.5
series I = 0.5
' (10) if V lies between 1.5 and 0.5 and signal(1)<=0 then signal =0.5
SMPL IF V>1.5 and V<0.5 and I(1)<=0.5
series I = 0.5
'(11) if V lies between 2 and 1.5 and and signal(1) = 1 then 1
SMPL IF V>2 and V<=1.5 and I(1)=1
series I = 1
'(12) if V lies between 2 and 1.5 and and signal(1) = 0.5 then 0.5
SMPL IF V>2 and V<=1.5 and I(1)=0.5
series I = 0.5
'(13) if V lies between 2 and 1.5 and and signal(1) <= 0 then 0.5
SMPL IF V>2 and V<=1.5 and I(1)=0.5
series I = 0.5
'(14) if V <= 2 then signal =1
SMPL IF V <=2
series I = 1
for !horizon=1 to 300
smpl 1970w1 1999w2+!horizon
next
smpl 1970w1 @now
next
Help in construct an indicator(I) based the value of the date and value(V) and the lag value of itself lag(1)( I)
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Help in construct an indicator(I) based the value of the date and value(V) and the lag value of itself lag(1)( I)
 Attachments

 DataLoop.xlsx
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 EViews Developer
 Posts: 313
 Joined: Thu Apr 25, 2013 7:48 pm
Re: Help in construct an indicator(I) based the value of the date and value(V) and the lag value of itself lag(1)( I)
Hello,
There are several syntax errors in your program. When you're new to EViews, I suggest that you write your program incrementally and in small steps, i.e., write a few lines, run it, and see if it's working correctly. It's much easier to find problems when only a few lines have changed.
Independent of the syntax problems, I believe your program's overall strategy of using samples to separate the different indicator cases isn't going to work because of the dependence on the lagged indicator. I believe you'll find it easier to work with a simple loop containing your cases in if statements. For example, after importing the data from the Excel file,
There are several syntax errors in your program. When you're new to EViews, I suggest that you write your program incrementally and in small steps, i.e., write a few lines, run it, and see if it's working correctly. It's much easier to find problems when only a few lines have changed.
Independent of the syntax problems, I believe your program's overall strategy of using samples to separate the different indicator cases isn't going to work because of the dependence on the lagged indicator. I believe you'll find it easier to work with a simple loop containing your cases in if statements. For example, after importing the data from the Excel file,
Code: Select all
smpl if V <> na
I = 0
for !j = 2 to @obssmpl
if V(!j) >= 2 then
I(!j) = 1
else if V(!j) < 2 and V(!j) >= 1.5 and I(!j  1) > 1 then
I(!j) = 0.5
else if V(!j) < 2 and V(!j) >= 1.5 and I(!j  1) = 1 then
I(!j) = 1
else
' More cases
endif
endif
endif
endif
next
Re: Help in construct an indicator(I) based the value of the date and value(V) and the lag value of itself lag(1)( I)
Thanks your for your reply. I will follow your advice.
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