## Search found 3370 matches

Wed Oct 17, 2018 4:12 pm
Forum: Estimation
Topic: Defining derivatives and constrains?
Replies: 14
Views: 260

### Re: Defining derivatives and constrains?

Show people exactly what you've done and maybe someone will chime in having figured out where things have gone astray.
Wed Oct 17, 2018 3:18 pm
Forum: Estimation
Topic: Defining derivatives and constrains?
Replies: 14
Views: 260

### Re: Defining derivatives and constrains?

I think what's happening is that the command you are using puts a coefficient in front of each term. Try writing this out specified as a formula as shown at http://www.eviews.com/help/helpintro.html#page/content%2FRegress1-Specifying_an_Equation_in_EViews.html
Wed Oct 17, 2018 5:40 am
Forum: Estimation
Topic: Defining derivatives and constrains?
Replies: 14
Views: 260

### Re: Defining derivatives and constrains?

You might want to post the exact command you used and your output.
Sun Oct 14, 2018 10:02 am
Forum: Data Manipulation
Topic: genr x from quarterly page to yield a particular annual growth rate
Replies: 11
Views: 260

### Re: genr x from quarterly page to yield a particular annual growth rate

I think

Code: Select all

`!annualgrowthrate = 100 * (@mav(x,4)/@mav(x(-4),4)-1)`

works. But I'd give it a test.
Sun Oct 14, 2018 6:52 am
Forum: Data Manipulation
Topic: genr x from quarterly page to yield a particular annual growth rate
Replies: 11
Views: 260

### Re: genr x from quarterly page to yield a particular annual growth rate

If you only know x1, for example, I don't see how you can compute (x8+x7+x6+x5) / (x4+x3+x2+x1)
Sat Oct 13, 2018 6:53 am
Forum: Data Manipulation
Topic: genr x from quarterly page to yield a particular annual growth rate
Replies: 11
Views: 260

### Re: genr x from quarterly page to yield a particular annual growth rate

Maybe

Code: Select all

`x = (1+!annualgrowthrate/4)*x(-1)`
Sun Oct 07, 2018 8:08 am
Forum: Data Manipulation
Topic: Unbalanced panel data
Replies: 3
Views: 114

### Re: Unbalanced panel data

Almost. You don't have to have all values for all cross-sections, but you do need all values for some cross-sections.
Sun Oct 07, 2018 7:25 am
Forum: Data Manipulation
Topic: Unbalanced panel data
Replies: 3
Views: 114

### Re: Unbalanced panel data

Observations are only included in a regression when all the variables have values for a that observation.
Wed Oct 03, 2018 7:41 pm
Forum: Programming
Topic: MTOS
Replies: 18
Views: 280

### Re: MTOS

wsave, not wsafe
Thu Sep 20, 2018 10:54 am
Forum: Bug Reports
Replies: 0
Views: 50

Here are two Excel files that differ only in that I moved the date column at the right in the first to be on the left in the second. EViews reads the dates in the second but not the first.
Wed Sep 19, 2018 7:49 pm
Forum: Estimation
Topic: Defining derivatives and constrains?
Replies: 14
Views: 260

### Re: Defining derivatives and constrains?

I'm not sure there are any general tricks, although perhaps someone has a list of useful ones.
Wed Sep 19, 2018 7:17 pm
Forum: Estimation
Topic: Defining derivatives and constrains?
Replies: 14
Views: 260

### Re: Defining derivatives and constrains?

Hello There, I'm trying to fit the following equation (known as lotka-Volterra) to real data series (x, y, z) to estimate its parameters (a, b, c, d): dx/dt = (a)x - (b)x^2 + (c)x*y - (d)x*z Could you please help mw with followings? 1- how could I define dx/dt in the equation specification? 2- Is t...
Wed Sep 19, 2018 6:22 pm
Forum: Estimation
Topic: Defining derivatives and constrains?
Replies: 14
Views: 260

### Re: Defining derivatives and constrains?

Hello There, I'm trying to fit the following equation (known as lotka-Volterra) to real data series (x, y, z) to estimate its parameters (a, b, c, d): dx/dt = (a)x - (b)x^2 + (c)x*y - (d)x*z Could you please help mw with followings? 1- how could I define dx/dt in the equation specification? 2- Is t...
Tue Sep 18, 2018 8:40 am
Forum: Bug Reports
Topic: bad axis scaling (not exactly a bug, but...)
Replies: 0
Views: 88

### bad axis scaling (not exactly a bug, but...)

Here's a scatter diagram with the y-axis being a dummy variable. Having the "2" label when no point is above 1 is kinda ugly.
Capture.PNG (16.67 KiB) Viewed 57 times
Tue Sep 18, 2018 8:39 am
Forum: Econometric Discussions
Topic: Automatic ARIMA Forecasting
Replies: 2
Views: 251

### Re: Automatic ARIMA Forecasting

In one case you are predicting the first difference and in the other you are predicting the level.