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From |
"RAMPL Linn" <Linn.RAMPL@insead.edu> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: How to graph means with correct SE after repeated ANOVA? |

Date |
Thu, 25 Mar 2010 15:24:53 +0100 |

Dear statalists, I am trying to graph the means of a 2-way REPEATED ANOVA in bar charts and would like to include the correct standard errors. Here is how I would do this in a BETWEEN subject 2-way ANOVA: ------------------------------------------------------------------------ -- Y = like X1 = trial_2 (binary) X2 = frequency (binary) collapse (mean) m_like=like (sd) sd_like=like (count) n_like=like, by(trial_2 wta_group) generate like_uc1 = m_like + invttail(n_like,0.025)*sd_like/sqrt(n_like) generate like_lc1 = m_like - invttail(n_like,0.025)*sd_like/sqrt(n_like) generate group_trial_2 = trial_2 if wta_group == 0 replace group_trial_2 = trial_2 + 3 if wta_group == 1 #delimit ; twoway (bar m_like group_trial_2 if trial_2 == 0, color(gs2)) (bar m_like group_trial_2 if trial_2 == 1, color(gs11)) (rcap like_uc1 like_lc1 group_trial_2) ; #delimit cr ------------------------------------------------------------------------ -- But since the both covariates are repeated variables across subjects, the standard errors would not be correct in the example above. I tried the postestimation command "anovaplot" (which does not plot bars but only dots, I guess?!) but it does not work after a repeated regression, since it needs to have the repeated variable (in this case the subjects) included in the command. Therefore, the desired command "anovaplot trial_2 frequency" does not work, only "anovaplot subject trial_2 frequency", which gives you a plot including the results for EVERY participant instead of the group means for trial_2 and frequency and does not include the SE either. ==> Does anyone know how to do a bar chart with the means for the two REPEATED covariates (trial_2 and frequency, repeated over subjects) including the STANDARD ERRORS? That would really help a lot!! Appreciate any advice! Thanks. Best Linn * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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