夏目贵志 发表于 2015-11-9 13:38
你数据占用多大内存？

leejs 发表于 2015-11-9 15:51
大概有13000个数据

夏目贵志 发表于 2015-11-10 00:58
有多少个观测值其实并不重要。如果你只有两个整数型变量，这点数据根本不算什么。你要是有上千个变量，还 ...

leejs 发表于 2015-11-10 10:00
那我的为什么跑不出来呢，求高人指点。我一般创造变量都是  gen  x=……

On Wed, May 22, 2013 at 8:55 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> I presume focus on -nl-.
>
> Convergence is more likely if
>
> 1. the model is actually right for the data in a qualitative sense
> (easy to say, hard to define, obvious when it fits well)
>
> 2. you supply good initial guesses for the parameters (this is perhaps
> the easiest one to tweak)
>
> 3. you are estimating a small number of parameters
>
> 4. you have a good ratio of data points to parameters
>
> 5. the data are not grotesquely behaved (e.g. outliers and high
> skewness can be just as problematic as with linear models)
>
> 6. the model is not highly nonlinear (the textbooks are full of this)
>
> 7. I like lists to have about 7 items, so something else belongs here.
>
> Maarten Buis should have a Euro for every time he's recommended
> retreating to a simpler model when a complicated one doesn't converge,
> and then adding complexity one step at a time. But it's good advice.
>
> Nick
> njcoxstata@gmail.com

夏目贵志 发表于 2015-11-10 12:58
这类估计方法的确会有这个问题。如果不是你的命令有错或者数据有问题，那就没有什么一定管用的办法了。下 ...