Math & Science ⇒ Align Equations within Align?

[SaneAssasin]

Hi,

In this minimal working example, I want to align these I(\theta) and Var(\hat{\theta}), but can't seem to figure it out.

Any suggestions on how this can be done?

Code: Select all

\documentclass{Article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
I(\theta)&=\frac{2n(1-\theta)^2+2n(\theta(1-\theta)}{(1-\theta)^2}+\frac{2n\theta(1-\theta)+2n\theta^2}{\theta^2}
\\&=\frac{2n}{\theta(1-\theta)}
\end{align*}
\[Var(\hat{\theta})\approx\frac{1}{I(\theta})\indent I(\hat{\theta}=\frac{2n}{\hat{\theta}(1-\hat{\theta})}\]
\end{document} 

Thanks!

[svend_tveskaeg]

First: This is not a MWE. If you had tried to compiled it yourself before posting it, you would see that.

Here is a MWE (assuming that I have understood you correct):

Code: Select all

\documentclass{article}

\usepackage{amsmath}
\DeclareMathOperator{\var}{Var}

\begin{document}

\begin{align*}
  I(\theta)
  &= \frac{2n(1-\theta)^2+2n(\theta(1-\theta)}{(1-\theta)^2}+\frac{2n\theta(1-\theta)+2n\theta^2}{\theta^2}
   = \frac{2n}{\theta(1-\theta)}\\
  \var(\hat{\theta})
  &\approx \frac{1}{I(\theta)}\\
  I(\hat{\theta})
  &= \frac{2n}{\hat{\theta}(1-\hat{\theta})}
\end{align*}

\end{document}

[SaneAssasin]

First: This is not a MWE. If you had tried to compiled it yourself before posting it, you would see that.

Here is a MWE (assuming that I have understood you correct):

Code: Select all

\documentclass{article}

\usepackage{amsmath}
\DeclareMathOperator{\var}{Var}

\begin{document}

\begin{align*}
  I(\theta)
  &= \frac{2n(1-\theta)^2+2n(\theta(1-\theta)}{(1-\theta)^2}+\frac{2n\theta(1-\theta)+2n\theta^2}{\theta^2}
   = \frac{2n}{\theta(1-\theta)}\\
  \var(\hat{\theta})
  &\approx \frac{1}{I(\theta)}\\
  I(\hat{\theta})
  &= \frac{2n}{\hat{\theta}(1-\hat{\theta})}
\end{align*}

\end{document}

How was what I posted not a minimum working example? I did compile it before I posted it and it didn't give any errors, and I haven't used any obscure packages.

But anyway, I want the to break the first line at the second equal sign and align it with the first equal sign, as I had in the example I gave:

Code: Select all

 \begin{align*}
I(\theta)&=\frac{2n(1-\theta)^2+2n(\theta(1-\theta)}{(1-\theta)^2}+\frac{2n\theta(1-\theta)+2n\theta^2}{\theta^2}
\\&=\frac{2n}{\theta(1-\theta)}
\end{align*}

I then want to align

Code: Select all

 Var(\hat{\theta})\approx\frac{1}{I(\theta})\indent I(\hat{\theta}=\frac{2n}{\hat{\theta}(1-\hat{\theta})} 

with I(\theta) of the first equation.

Does that make sense? And also, please tell me how that's not a proper MWE...A lot of people have said that in my posts, but I don't understand how...

[svend_tveskaeg]

It is not a minimal working example because your code can't be compiled. The name of the document class is article, not Article. (And I am absolutely positive that you haven't compiled it, because it can't be done.)

Now to your example: Maybe this is what you want (even though I think my suggestion looks better but that is of course for you to decide):

Code: Select all

\documentclass{article}

\usepackage{amsmath}
\DeclareMathOperator{\var}{Var}

\begin{document}

\begin{align*}
  I(\theta)
  &= \frac{2n(1-\theta)^2+2n(\theta(1-\theta)}{(1-\theta)^2}+\frac{2n\theta(1-\theta)+2n\theta^2}{\theta^2}\\
  &= \frac{2n}{\theta(1-\theta)}\\
  \var(\hat{\theta})
  &\approx \frac{1}{I(\theta)}
  \qquad I(\hat{\theta}) = \frac{2n}{\hat{\theta}(1-\hat{\theta})}
\end{align*}

\end{document}

[SaneAssasin]

It is not a minimal working example because your code can't be compiles. The name of the document class is article, not Article. (And I am absolutely positive that you haven't compiled it, because it can't be done.)

Now to your example: Maybe this is what you want (even though I think my suggestion looks better but that is of course for you to decide):

Code: Select all

\documentclass{article}

\usepackage{amsmath}
\DeclareMathOperator{\var}{Var}

\begin{document}

\begin{align*}
  I(\theta)
  &= \frac{2n(1-\theta)^2+2n(\theta(1-\theta)}{(1-\theta)^2}+\frac{2n\theta(1-\theta)+2n\theta^2}{\theta^2}\\
  &= \frac{2n}{\theta(1-\theta)}\\
  \var(\hat{\theta})
  &\approx \frac{1}{I(\theta)}
  \qquad I(\hat{\theta}) = \frac{2n}{\hat{\theta}(1-\hat{\theta})}
\end{align*}

\end{document}

Hi,

Yes, this is what I was trying to do, thanks!

And no, I definitely compiled it using PDFLaTeXify, WinEdt 7.0 and Miktek 2.9.

Any idea why I can and you can't...? :S

[SaneAssasin]

Actually, I tried writing it all in capitals and it still compiles. I don't think document classes are case sensitive...

[svend_tveskaeg]

Actually, I tried writing it all in capitals and it still compiles. I don't think document classes are case sensitive...

Well, it is because of what I said, that is all I can say.

[SaneAssasin]

Actually, I tried writing it all in capitals and it still compiles. I don't think document classes are case sensitive...

Well, it is because of what I said, that is all I can say.

Okay, well, it compiled perfectly as is. Anyway, thanks.

[svend_tveskaeg]

Try to compile your code by clicking on the "OPEN IN WRITELATEX" botton. Next, change Article to article and try again.

[SaneAssasin]

Try to compile your code by clicking on the "OPEN IN WRITELATEX" Botton. Next, change Article to article and try again.

Okay, my apologies. It compiled perfectly in my editor, which is what I was trying to say.

Sorry if I came off rude.