Cfrgtkky

I am new to LaTeX, so please be kind to me. :) I would like to place three mathematical formulas next to each other but I don't seem to get it working.

This is how far I have got up to now:

documentclass[paper=a4,pagesize,fontsize=12pt]{scrartcl}



begin{document}



renewcommand{arraystretch}{1}

begin{tabular}{l}

hspace{1cm} vspace{0.2cm}

(displaystyle widetilde{y_i}=bx_i+a )  hspace{3cm}\

$widetilde{y_i}$ ldots vorhergesagter Wert \

$b$ ldots slope (Steigung der Regressionsgerade) \ 

$a$ ldots intercept (Gerade schneidet y-Achse, an der Stelle x=0) \



        end{tabular}

    vspace{0.22cm}

begin{center}





    begin{tabular}{cc}

    renewcommand{arraystretch}{1.5}

        begin{tabular}{l}



        ( displaystyle b=frac{s_{XY}}{s_X^2} ) \[0.4cm]

        end{tabular}

        renewcommand{arraystretch}{1.5}

            begin{tabular}{ccc}

                & ( displaystyle a=bar{y}-bbar{x} ) &   \ [0.4cm] 

            end{tabular}



    end{tabular}



end{center}



    vspace{0.22cm}

end{document}

This is what it looks like at the moment:

I would like to put the formula for b=sXY... and the formula for a=y-b*x
higher up so that it is in the same line with the first formula (y_i= b*x_i+a).

I hope that you understand my problem and that someone is able to help me.

Thanks a lot already in advance.

Maybe like this:

documentclass[paper=a4,pagesize,fontsize=12pt]{scrartcl}

usepackage{amsmath}

begin{document}

Text above

begin{align*}

widetilde{y_i}&=bx_i+a, & b&=frac{s_{XY}}{s_X^2}, & displaystyle a&=bar{y}-bbar{x},

end{align*}

where

begin{align*}

widetilde{y_i}  &ldots  text{vorhergesagter Wert} \

b  &ldots text{slope (Steigung der Regressionsgerade)} \ 

a  &ldots text{intercept (Gerade schneidet $y$-Achse, an der Stelle $x=0$)} 

end{align*}

end{document}

Keep it simple:

documentclass[paper=a4,pagesize,fontsize=12pt]{scrartcl}

usepackage{amsmath}

usepackage{enumitem}



usepackage{showframe} % just to show the page margins



begin{document}



begin{gather*}

tilde{y}_i=bx_i+a

qquad

b=frac{s_{XY}}{s_X^2}

qquad

a=bar{y}-bbar{x}

\

begin{minipage}{0.8displaywidth}

begin{itemize}[label=,nosep,leftmargin=0pt]

item $tilde{y}_i$ vorhergesagter Wert

item $b$ slope (Steigung der Regressionsgerade)

item $a$ intercept (Gerade schneidet $y$-Achse, an der Stelle $x=0$)

end{itemize}

end{minipage}

end{gather*}



end{document}

You can later change your mind about the label in the itemize environment.

With gather* we ensure no page break is feasible between the equations and their descriptions.

Make it easy.

See if this way of alignment suit you :)

documentclass{scrartcl}

usepackage{amsmath}

begin{document}

Blah blah we have:

begin{align*}

    widetilde{y_i}=bx_i+a qquadquad b=frac{s_{XY}}{s_X^2} qquadquad a=bar{y}- bbar{x}

end{align*}

[ % or () for inline mode if you want

    text{where }left{

        begin{array}{rcl}

            widetilde{y_i} & ldots & text{vorhergesagter Wert}\

             b              & ldots & text{slope (Steigung der Regressionsgerade)}\

             a              & ldots & text{intercept (Gerade schneidet $y$-Achse, an der Stelle $x=0$)}

        end{array}

    right.

]

end{document}

Thank you guys all so so much for your much-appreciated help. My document looks really good now. :)

I have one last question:

How can I make the

y_i... vorhergesagter Wert, 

b...slope, 

a...intercept AND 

r_i... Residuum, 

y_i... beobachteter Wert, 

widetilde y_i... vorhergesagter Wert 

make appear aligned under each other. I would like both parts either to be in the center or on the left.

flushleft textbf {Die Regressionsgerade:} 



begin{gather*} 



    widetilde{y}_i=bx_i+a



    qquad



    b=frac{s_{XY}}{s_X^2}



    qquad



    a=bar{y}-bbar{x}



    \



    begin{minipage}{0.8displaywidth}



        begin{itemize}[label=,nosep,leftmargin=0pt]



            item $widetilde{y}_i$ ldots vorhergesagter Wert



            item $b$ ldots slope (Steigung der Regressionsgerade)



            item $a$ ldots intercept (Gerade schneidet $y$-Achse, an der Stelle $x=0$) \[0.4cm]



        end{itemize}



    end{minipage}



end{gather*}



flushleft textbf {Residuen:} 



begin{center}



    renewcommand{arraystretch}{1}



    begin{tabular}{l}



        hspace{1cm} vspace{0.2cm}



        (displaystyle r_i = y_i - widetilde{y_i} )  hspace{3cm}\



        $r_i$ ldots Residuum für Beobachtung $i$\



        $y_i$ ldots beobachteter Wert von Person $i$\



        $widetilde{y_i}$ ldots vorhergesagter Wert von Person $i$\[0.4cm]



    end{tabular}



end{center}



vspace{0.22cm}

Thank you so much one more time.