Recent content by srpang89

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    Best way to visualize (in figures) the results from a non-normal GLM?

    Is my best bet going to be with R here?
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    Best way to visualize (in figures) the results from a non-normal GLM?

    So, I've tried to find the best way to graph these. As far as I can tell, the two programs that I'm familiar with (JMP and SigmaPlot) don't have an option to fit a negative binomial curve. Any other programs you'd recommend I check out?
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    Best way to visualize (in figures) the results from a non-normal GLM?

    Of course. So, this model here is actually just a negative binomial GLM (non-ZI) with a blocking factor, a continuous predictor (proportion of males), the interaction, and two additional covariates (male and female size). Here is the full model: And the reduced model: Here's a link to the...
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    Best way to visualize (in figures) the results from a non-normal GLM?

    Hi, I've got a zero inflated, negative binomial GLM that I'm using and am curious what the best way to visually represent my results in figures would be. My model doesn't have a ton of factors; I'm looking at a blocking factor, a continuous predictor, the interaction between the two and two...
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    Dropping the blocking factor from models if it's not significant?

    What's everybody's thoughts on dropping a blocking factor from models? I have a professor that's a big fan of blocking in ecological field experiments. He's always encouraged us to include a block factor (if applicable) during the experimental design. If it's significant...great. If it's not...
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    Repeated measures, ZI negative binomial GLM?

    Hi all, So...I'm not entirely sure if this is possible but thought I'd post here to ask. Additionally, I've never used R before (except for screwing around for an hour or two in Swirl) so please bear with me. I'm trying to run a repeated measures, zero-inflated negative binomial GLM...
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    What's the difference between running an ANCOVA and running an ANOVA with the residuals (of the covariate) as the response?

    Great, thank you for the really informative reply! That makes sense. I think I'll just stick with the ANCOVA then. Seems way more straight forward.
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    What's the difference between running an ANCOVA and running an ANOVA with the residuals (of the covariate) as the response?

    Hope that title wasn't too confusing. Anyways...say I'm interested in how a covariate might be influencing my response variable. Besides running it as an ANCOVA, I've also heard that you can run a regression of the covariate with the response variable. Then you can use those residuals from that...
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    When running a GLiM...how do you decide which estimation method to use?

    Currently, I'd say I'm trying to develop an explanatory model that (unfortunately) only has a few predictor variables. I've got a blocking term, a continuous predictor, the interaction between those two, and two additional covariates. With so few IV's, should I even be using selection...
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    When running a GLiM...how do you decide which estimation method to use?

    When running a generalized linear model, how do you decide which estimation to use? For example, maximum likelihood, forward selection, lasso, elastic net, etc. Would I prefer to keep all of my predictors and choose a method that doesn't select (i.e., maximum likelihood or ridge) when I only...
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    How to determine which factors/interactions to remove from a model?

    How do you determine which factors/interactions to remove from a model? Should I be dropping higher-order interactions from my model if they aren't significant and aren't increasing my R-square/F-ratio? Asking specifically for an ANCOVA that I'm running (two categorical IV's and one covariate)...