Generate an alpha diversity line plot for longitudinal data — generate_alpha_spaghettiplot

This function creates a ggplot object of alpha diversity (e.g., Shannon index) line plot for longitudinal data, showing individual subject trajectories and the mean trajectory for each group.

Usage

generate_alpha_spaghettiplot_long(
  data.obj,
  alpha.obj = NULL,
  alpha.name = c("shannon", "simpson", "observed_species", "chao1", "ace", "pielou"),
  depth = NULL,
  subject.var,
  time.var,
  t0.level,
  ts.levels,
  group.var = NULL,
  strata.var = NULL,
  adj.vars = NULL,
  base.size = 16,
  palette = NULL,
  theme.choice = "bw",
  custom.theme = NULL,
  pdf = TRUE,
  file.ann = NULL,
  pdf.wid = 11,
  pdf.hei = 8.5,
  ...
)

Arguments

data.obj

A list object in a format specific to MicrobiomeStat, which can include components such as feature.tab (matrix), feature.ann (matrix), meta.dat (data.frame), tree, and feature.agg.list (list). The data.obj can be converted from other formats using several functions from the MicrobiomeStat package, including: 'mStat_convert_DGEList_to_data_obj', 'mStat_convert_DESeqDataSet_to_data_obj', 'mStat_convert_phyloseq_to_data_obj', 'mStat_convert_SummarizedExperiment_to_data_obj', 'mStat_import_qiime2_as_data_obj', 'mStat_import_mothur_as_data_obj', 'mStat_import_dada2_as_data_obj', and 'mStat_import_biom_as_data_obj'. Alternatively, users can construct their own data.obj. Note that not all components of data.obj may be required for all functions in the MicrobiomeStat package.

alpha.obj

An optional list containing pre-calculated alpha diversity indices. If NULL (default), alpha diversity indices will be calculated using mStat_calculate_alpha_diversity function from MicrobiomeStat package.

alpha.name

The alpha diversity index to be plotted. Supported indices include "shannon", "simpson", "observed_species", "chao1", "ace", and "pielou". Previously named as `alpha.index`.

depth

An integer specifying the sequencing depth for the "Rarefy" and "Rarefy-TSS" methods. If NULL, no rarefaction is performed.

subject.var

The name of the subject variable.

time.var

The name of the time variable.

t0.level

Character or numeric, baseline time point for longitudinal analysis, e.g. "week_0" or 0. Required.

ts.levels

Character vector, names of follow-up time points, e.g. c("week_4", "week_8"). Required.

group.var

The name of the group variable.

strata.var

The name of the strata variable (default is NULL).

adj.vars

A character vector of variable names to be used for adjustment.

base.size

The base font size for the plot.

palette

An optional parameter specifying the color palette to be used for the plot. It can be either a character string specifying the name of a predefined palette or a vector of color codes in a format accepted by ggplot2 (e.g., hexadecimal color codes). Available predefined palettes include 'npg', 'aaas', 'nejm', 'lancet', 'jama', 'jco', and 'ucscgb', inspired by various scientific publications and the `ggsci` package. If `palette` is not provided or an unrecognized palette name is given, a default color palette will be used. Ensure the number of colors in the palette is at least as large as the number of groups being plotted.

theme.choice

Plot theme choice. Specifies the visual style of the plot. Can be one of the following pre-defined themes: - "prism": Utilizes the ggprism::theme_prism() function from the ggprism package, offering a polished and visually appealing style. - "classic": Applies theme_classic() from ggplot2, providing a clean and traditional look with minimal styling. - "gray": Uses theme_gray() from ggplot2, which offers a simple and modern look with a light gray background. - "bw": Employs theme_bw() from ggplot2, creating a classic black and white plot, ideal for formal publications and situations where color is best minimized. - "light": Implements theme_light() from ggplot2, featuring a light theme with subtle grey lines and axes, suitable for a fresh, modern look. - "dark": Uses theme_dark() from ggplot2, offering a dark background, ideal for presentations or situations where a high-contrast theme is desired. - "minimal": Applies theme_minimal() from ggplot2, providing a minimalist theme with the least amount of background annotations and colors. - "void": Employs theme_void() from ggplot2, creating a blank canvas with no axes, gridlines, or background, ideal for custom, creative plots. Each theme option adjusts various elements like background color, grid lines, and font styles to match the specified aesthetic. Default is "bw", offering a universally compatible black and white theme suitable for a wide range of applications.

custom.theme

A custom ggplot theme provided as a ggplot2 theme object. This allows users to override the default theme and provide their own theme for plotting. Custom themes are useful for creating publication-ready figures with specific formatting requirements.

To use a custom theme, create a theme object with ggplot2::theme(), including any desired customizations. Common customizations for publication-ready figures might include adjusting text size for readability, altering line sizes for clarity, and repositioning or formatting the legend. For example:

“`r my_theme <- ggplot2::theme( axis.title = ggplot2::element_text(size=14, face="bold"), # Bold axis titles with larger font axis.text = ggplot2::element_text(size=12), # Slightly larger axis text legend.position = "top", # Move legend to the top legend.background = ggplot2::element_rect(fill="lightgray"), # Light gray background for legend panel.background = ggplot2::element_rect(fill="white", colour="black"), # White panel background with black border panel.grid.major = ggplot2::element_line(colour = "grey90"), # Lighter color for major grid lines panel.grid.minor = ggplot2::element_blank(), # Remove minor grid lines plot.title = ggplot2::element_text(size=16, hjust=0.5) # Centered plot title with larger font ) “`

Then pass `my_theme` to `custom.theme`. If `custom.theme` is NULL (the default), the theme is determined by `theme.choice`. This flexibility allows for both easy theme selection for general use and detailed customization for specific presentation or publication needs.

pdf

Logical, whether to save the plot as a PDF (default is TRUE).

file.ann

The annotation to be added to the PDF file name (default is NULL).

pdf.wid

The width of the output PDF file. Default is 11.

pdf.hei

The height of the output PDF file. Default is 8.5.

...

Additional arguments passed to ggplot().

Value

A ggplot object of the alpha diversity line plot.

Examples

if (FALSE) { # \dontrun{
data("subset_T2D.obj")
T2D.alpha.obj <- mStat_calculate_alpha_diversity(subset_T2D.obj$feature.tab,"shannon")
generate_alpha_spaghettiplot_long(
  data.obj = subset_T2D.obj,
  alpha.obj = T2D.alpha.obj,
  alpha.name = c("shannon"),
  subject.var = "subject_id",
  time.var = "visit_number",
  t0.level = sort(unique(subset_T2D.obj$meta.dat$visit_number))[1],
  ts.levels = sort(unique(subset_T2D.obj$meta.dat$visit_number))[-1],
  group.var = "subject_gender",
  strata.var = "subject_race",
  adj.vars = "sample_body_site",
  theme.choice = "bw",
  palette = "lancet",
  pdf = TRUE,
  file.ann = NULL,
  pdf.wid = 11,
  pdf.hei = 8.5
)

data("ecam.obj")
generate_alpha_spaghettiplot_long(
  data.obj = ecam.obj,
  alpha.obj = NULL,
  alpha.name = c("shannon","simpson", "observed_species"),
  subject.var = "subject.id",
  time.var = "month_num",
  t0.level = NULL,
  ts.levels = NULL,
  group.var = NULL,
  strata.var = NULL,
  adj.vars = NULL,
  theme.choice = "bw",
  palette = "lancet",
  pdf = TRUE,
  file.ann = NULL,
  pdf.wid = 11,
  pdf.hei = 8.5
)
generate_alpha_spaghettiplot_long(
  data.obj = ecam.obj,
  alpha.obj = NULL,
  alpha.name = c("shannon","simpson", "observed_species"),
  subject.var = "subject.id",
  time.var = "month_num",
  t0.level = NULL,
  ts.levels = NULL,
  group.var = "delivery",
  strata.var = NULL,
  adj.vars = NULL,
  theme.choice = "bw",
  palette = "lancet",
  pdf = TRUE,
  file.ann = NULL,
  pdf.wid = 11,
  pdf.hei = 8.5
)
generate_alpha_spaghettiplot_long(
  data.obj = ecam.obj,
  alpha.obj = NULL,
  alpha.name = c("shannon","simpson", "observed_species"),
  subject.var = "subject.id",
  time.var = "month_num",
  t0.level = NULL,
  ts.levels = NULL,
  group.var = "delivery",
  strata.var = "diet",
  adj.vars = NULL,
  theme.choice = "bw",
  palette = "lancet",
  pdf = TRUE,
  file.ann = NULL,
  pdf.wid = 11,
  pdf.hei = 8.5
)
generate_alpha_spaghettiplot_long(
  data.obj = ecam.obj,
  alpha.obj = NULL,
  alpha.name = c("shannon","simpson", "observed_species"),
  subject.var = "subject.id",
  time.var = "month_num",
  t0.level = NULL,
  ts.levels = NULL,
  group.var = "delivery",
  strata.var = "diet",
  adj.vars = "antiexposedall",
  theme.choice = "bw",
  palette = "lancet",
  pdf = TRUE,
  file.ann = NULL,
  pdf.wid = 11,
  pdf.hei = 8.5
)
} # }