# Assess Water Quality Trends with Generalized Additive Models

## Documentation for package ‘wqtrends’ version 1.5.2

- DESCRIPTION file.
- User guides, package vignettes and other documentation.
- Package NEWS.

## Help Pages

anlz_avgseason | Extract period (seasonal) averages from fitted GAM
anlz_backtrans | Back-transform response variable
anlz_fit | Return summary statistics for GAM fits
anlz_gam | Fit a generalized additive model to a water quality time series
anlz_metseason | Extract period (seasonal) metrics from fitted GAM
anlz_mixmeta | Fit a mixed meta-analysis regression model of trends
anlz_perchg | Estimate percent change trends from GAM results for selected time periods
anlz_prd | Get predicted data from fitted GAMs across period of observation
anlz_prdday | Get predicted data from fitted GAMs across period of observation, every day
anlz_prdmatrix | Get prediction matrix for a fitted GAM
anlz_pvalformat | Format p-values for show functions
anlz_smooth | Return summary statistics for smoothers of GAMs
anlz_sumstats | Retrieve summary statistics for seasonal metrics and trend results
anlz_sumtrndseason | Estimate seasonal rates of change based on average estimates for multiple window widths
anlz_trans | Transform response variable
anlz_trndseason | Estimate rates of change based on seasonal metrics
rawdat | Raw data from San Francisco Estuary (South Bay)
show_metseason | Plot period (seasonal) averages from fitted GAM
show_mettrndseason | Plot seasonal metrics and rates of change
show_perchg | Plot percent change trends from GAM results for selected time periods
show_prd3d | Plot a 3-d surface of predictions
show_prddoy | Plot predictions for GAMs against day of year
show_prdseason | Plot predictions for GAMs over time, by season
show_prdseries | Plot predictions for GAMs over time series
show_sumtrndseason | Plot seasonal rates of change based on average estimates for multiple window widths
show_sumtrndseason2 | Plot seasonal rates of change in quarters based on average estimates for multiple window widths
show_trndseason | Plot rates of change based on seasonal metrics