walsby_generate_regression_ETR_I: Walsby Regression for ETR I
In pam: Fast and Efficient Processing of PAM Data

walsby_generate_regression_ETR_I

R Documentation

Walsby Regression for ETR I

Description

Fits a modified Walsby (1997) regression model without the respiration term, using Romoth (2019) naming conventions. Calculates ETR_{max} without accounting for photoinhibition.

Usage

walsby_generate_regression_ETR_I(
  data,
  etr_max_start_value = walsby_default_start_value_etr_max,
  alpha_start_value = walsby_default_start_value_alpha,
  beta_start_value = walsby_default_start_value_alpha
)

Arguments

`data`	A `data.table` from `read_dual_pam_data`.
`etr_max_start_value`	Numeric. Initial value for `ETR_{max}`. Default: `etr_max_start_value_walsby_default`.
`alpha_start_value`	Numeric. Initial value for `\alpha`. Default: `alpha_start_value_walsby_default`.
`beta_start_value`	Numeric. Initial value for `\beta`. Default: `beta_start_value_walsby_default`.

Details

A detailed documentation can be found under https://github.com/biotoolbox/pam?tab=readme-ov-file#walsby_generate_regression_etr_i-and-walsby_generate_regression_etr_ii.

Value

A list containing:

etr_regression_data: Predicted ETR values.
sdiff: Deviation between actual and predicted ETR.
etr_max: Maximum ETR (ETR_{max}).
alpha: Initial slope (\alpha).
beta: Photoinhibition factor (\beta).

References

Walsby, A. E. (1997). Numerical integration of phytoplankton photosynthesis through time and depth in a water column. New Phytologist, 136(2), 189-209. Available at: \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1046/j.1469-8137.1997.00736.x")}

Romoth, K., Nowak, P., Kempke, D., Dietrich, A., Porsche, C., & Schubert, H. (2019). Acclimation limits of Fucus evanescens along the salinity gradient of the southwestern Baltic Sea. Botanica Marina, 62(1), 1-12. Available at: \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1515/bot-2018-0098")}

Examples

path <- file.path(system.file("extdata", package = "pam"), "20240925.csv")
data <- read_dual_pam_data(path)

result <- walsby_generate_regression_ETR_I(data)

pam documentation built on April 4, 2025, 2:12 a.m.