## 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

works. But I'd give it a test.

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**

- 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
- Topic: Excel date read bug
- Replies:
**0** - Views:
**50**

### Excel date read bug

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.

- 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.