Two way ANOVA


I have 2 groups ('keypad' and 'touch screen'), and each group has teh number of participants who are 'right ahnded and left handed.

For key pad: 45 right handed and 42 left handed
For touch screen: 9 right handed and 15 left handed.

Can I use a two way ANOVA for this? the number of righthanded and left hnded for each group does not really differ, so can I use 2 way anova?

OR DO I need to have the same exact number of participants in each condition in ordr to perform two way ANOVA?

Please help!



Super Moderator
There is no restriction (or requirement) that your data must have exact equal sample sizes in each condition - a so-called "balanced desgin." You would want to use Type III sums of squares for an "unbalanced design"---a software package like SPSS would do this by default.


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You never state what your independent variable is. Is it a continous variable with normally distributed residuals in the ANOVA analyses?