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wombat:faqsconfusion [2018/07/02] kmeyer |
wombat:faqsconfusion [2018/09/13] (current) kmeyer [Confusion] |
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| - Generate a code for the interaction from the two fixed effects codes and write this to a new column in your data file. For example, if fixed effect A has a maximum value of 8571 and you want to fit an interaction between fixed effects A and B, the new code could be 10000*code(B)+code(A). In doing so, ensure that your new code is still a valid integer variable, i.e. does not exceed <color blue>**2,147,483,647**</color>. | - Generate a code for the interaction from the two fixed effects codes and write this to a new column in your data file. For example, if fixed effect A has a maximum value of 8571 and you want to fit an interaction between fixed effects A and B, the new code could be 10000*code(B)+code(A). In doing so, ensure that your new code is still a valid integer variable, i.e. does not exceed <color blue>**2,147,483,647**</color>. | ||
| - Fit this new effect as if it were a cross-classified fixed effect. | - Fit this new effect as if it were a cross-classified fixed effect. | ||
| - | - Check carefully for any dependencies among the fixed effects before running your analysis. If necessary, tell WOMBAT about them using the ''**ZEROUT**'' option. This is particularly important, if you want to fit effects A (or B) in addition to the interaction - you then have the interaction nested in A (or B), i.e. if effect A has //a// levels, you have //(a-1)// additional dependencies among the fixed effects. WOMBAT may find some of them, but you cannot rely on it. ~~UP~~ | + | - Check carefully for any dependencies among the fixed effects before running your analysis. If necessary, tell WOMBAT about them using the ''**ZEROUT**'' option. This is particularly important, if you want to fit effects A (or B) in addition to the interaction - you then have the interaction nested in A (or B), i.e. if effect A has //a// levels, you have //(a-1)// additional dependencies among the fixed effects. WOMBAT may find some of them, but you cannot rely on it. |
| =?=== Polynomial regression ==== | =?=== Polynomial regression ==== | ||
