BIOL 511: Create Boxplots of the Total Number of Plants - Statistics Assignment Help

Assignment Task:

Task:

1. Import the dataset in the file “southernAppsRiverHerbs.txt”. The dataset shows the number of plants found in separate plots in the southern Appalachians (Becky Brown’s PhD dissertation data).
2. Convert the geom2 column of the dataset into a factor.
3. Create boxplots of the total number of plants found in each plot (Total column) as a function of geomorphology (geom2). Do you believe there is a difference in the total numbers between different geomorphologies, based on these boxplots?
4. Create boxplots of the number of Carpinus caroliniana (column CARPCAR) as a function of geomorphology (geom2). Do you believe there is a difference in the number of this plant between different geomorphologies, based on these boxplots?
5. Create Cleveland dotplots of the total number of plants found in each plot (Total column) as a function of geomorphology (geom2). Do your conclusions based on these Cleveland dotplots agree with your conclusions based on the boxplots above?
6. Create Cleveland dotplots of the number of Carpinus caroliniana found in each plot (Total column) as a function of geomorphology (geom2). Do your conclusions based on these Cleveland dotplots agree with your conclusions based on the boxplots above?
7. Create histograms of the total number of plants, and the number of Carpinus caroliniana plants found in the plots. Do these look normally distributed?
8. Create a one-way univariate ANOVA model with the total number of plants as the response variable as a function of geomorphology as the predictor variable. Create a summary table for the ANOVA, and generate an effects plot to show the estimated mean total number of plants in each group with their 95% confidence intervals. Is there a significant difference in the total number of plants as a function of geomorphology? Which groups of geomorphology are significantly different from each other? Provide Tukey’s Honestly Significant Differences as evidence for the last question. Finally, report the AIC value of this model.
9. Generate diagnostic plots of the above ANOVA model. Are you concerned about any of the assumptions of ANOVA being violated for this model based on the diagnostic plots?
10. Create a one-way univariate ANOVA model with the number of Carpinus caroliniana plants as the response variable as a function of geomorphology as the predictor variable. Create a summary table for the ANOVA, and generate an effects plot to show the estimated mean number of Carpinus caroliniana plants in each group with their 95% confidence intervals. Is there a significant difference in the number of Carpinus caroliniana plants as a function of geomorphology? Which groups of geomorphology are significantly different from each other? Provide Tukey’s Honestly Significant Differences as evidence for the last question. Finally, report the AIC value of this model.
11. Generate diagnostic plots of the above ANOVA model. Are you concerned about any of the assumptions of ANOVA being violated for this model based on the diagnostic plots?
12. Create a generalized linear model with a Poisson distribution with the total number of plants as the response variable as a function of geomorphology as the predictor variable. Create a summary table for this model, and generate an effects plot to show the estimated mean total number of plants in each group with their 95% confidence intervals. Is there a significant difference in the total number of plants as a function of geomorphology? Which groups of geomorphology are significantly different from each other, based on the summary table and the effects plot?

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