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I'm using the flalign environment because I need to have some text (Level1, Level2) to the left of some equations. Now, I'd like to add a third equation (β1j = γ10). However, this equation does not align with the first two equations.

\begin{flalign} \begin{aligned} & \hspace{-3cm} \text{Level1:} & yij = \beta_{0j} + \beta_{1} x_{ij} + \epsilon_{ij} & \label{eq:L1} &\\ & \hspace{-3cm} \text{Level2:} & \beta_{0j} = \gamma_{00} + \gamma_{01 } z_{j}+ U_{0j} &\\ & & \hspace{-3cm} \beta_{1j} = \gamma_{10} &\\ \end{aligned} \end{flalign}

Right now it looks like this: enter image description here

Any idea on how I can make the equations aligned at the equal signs, but still have the text to the left of the first two equations?

Thanks

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    Please allow a few hours to one or two days before accepting a solution in order to give the chance for other contributors to provide their solutions. Thanks. Commented Aug 2, 2023 at 21:35

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The & character is used for alignment. I think you're looking to align on the = sign, so that's where you should be placing the ampersands:

\begin{flalign} \begin{aligned} & \hspace{-3cm} \text{Level1:} & yij &= \beta_{0j} + \beta_{1} x_{ij} + \epsilon_{ij} \label{eq:L1} \\ & \hspace{-3cm} \text{Level2:} & \beta_{0j} &= \gamma_{00} + \gamma_{01 } z_{j}+ U_{0j} \\ && \hspace{-3cm} \beta_{1j} &= \gamma_{10} \end{aligned} \end{flalign}

produces:

output of above latex code

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  • Ah, I thought that the & were for separating... But that makes much more sense. Thanks! Commented Aug 2, 2023 at 21:21
  • The third \hspace{-3cm} doesn't do anything useful and should therefore be omitted. As there's a single numbered equation, there's no need for the outer flalign environment; I suggest you employ an equation number instead. Finally, it may be confusing that the \label instruction is stuck inside the align environment; I'd place it right after \begin{equation} and before \begin{aligned}. Commented Aug 3, 2023 at 4:02
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Your flalign does nothing really useful.

Here are two realizations:

\documentclass{article} \usepackage{amsmath} \usepackage{showframe} \begin{document} Really flush left, but requires an odd number of lines to get the equation number centered \begin{flalign} &\text{Level 1:} & y_{ij} &= \beta_{0j} + \beta_{1} x_{ij} + \epsilon_{ij} & \notag\\ &\text{Level 2:} & \beta_{0j} &= \gamma_{00} + \gamma_{01 } z_{j}+ U_{0j} & \label{test} \\ & & \beta_{1j} &= \gamma_{10} & \notag \end{flalign} Not really flush left, adjust manually the dimension to suit your taste (here it is three centimeters) \begin{gather}\label{eq:L1} \begin{alignedat}{2} &\makebox[0pt][r]{\makebox[3cm][l]{Level 1:}} & y_{ij} &= \beta_{0j} + \beta_{1} x_{ij} + \epsilon_{ij} \\ &\makebox[0pt][r]{\makebox[3cm][l]{Level 2:}} & \beta_{0j} &= \gamma_{00} + \gamma_{01 } z_{j}+ U_{0j} \\ & & \beta_{1j} &= \gamma_{10} \end{alignedat} \end{gather} \end{document}

Take your pick. Note: showframe is only used to display the margins of the text block.

enter image description here

The following is what I'd like to see:

\documentclass{article} \usepackage{amsmath} \usepackage{showframe} \begin{document} Not flush left, but probably clearer about your intentions \begin{gather}\label{eq:L1} \begin{alignedat}{2} \makebox[0pt][r]{Level 1:\quad} && y_{ij} &= \beta_{0j} + \beta_{1} x_{ij} + \epsilon_{ij} \\ \makebox[0pt][r]{Level 2:\quad} && \beta_{0j} &= \gamma_{00} + \gamma_{01 } z_{j}+ U_{0j} \\ && \beta_{1j} &= \gamma_{10} \end{alignedat} \end{gather} \end{document}

enter image description here

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