Evaluate parent kinetics using the NAFTA guidance

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The function fits the SFO, IORE and DFOP models using mmkin -and returns an object of class nafta that has methods for printing -and plotting.

Print nafta objects. The results for the three models are printed in the -order of increasing model complexity, i.e. SFO, then IORE, and finally DFOP.

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nafta(ds, title = NA, quiet = FALSE, ...)
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-# S3 method for nafta
-print(x, quiet = TRUE, digits = 3, ...)

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Source

NAFTA (2011) Guidance for evaluating and calculating degradation -kinetics in environmental media. NAFTA Technical Working Group on -Pesticides -https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/guidance-evaluating-and-calculating-degradation -accessed 2019-02-22

US EPA (2015) Standard Operating Procedure for Using the NAFTA Guidance to -Calculate Representative Half-life Values and Characterizing Pesticide -Degradation -https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/standard-operating-procedure-using-nafta-guidance

Arguments

ds: A dataframe that must contain one variable called "time" with the -time values specified by the time argument, one column called -"name" with the grouping of the observed values, and finally one column of -observed values called "value".
title: Optional title of the dataset
quiet: Should the evaluation text be shown?
...: Further arguments passed to mmkin (not for the -printing method).
x: An nafta object.
digits: Number of digits to be used for printing parameters and -dissipation times.

Value

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An list of class nafta. The list element named "mmkin" is the -mmkin object containing the fits of the three models. The -list element named "title" contains the title of the dataset used. The -list element "data" contains the dataset used in the fits.

Author

Johannes Ranke

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Examples


-  nafta_evaluation <- nafta(NAFTA_SOP_Appendix_D, cores = 1)
-#> The SFO model is rejected as S_SFO is equal or higher than the critical value S_c
-#> The representative half-life of the IORE model is longer than the one corresponding
-#> to the terminal degradation rate found with the DFOP model.
-#> The representative half-life obtained from the DFOP model may be used
-  print(nafta_evaluation)
-#> Sums of squares:
-#>       SFO      IORE      DFOP 
-#> 1378.6832  615.7730  517.8836 
-#> 
-#> Critical sum of squares for checking the SFO model:
-#> [1] 717.4598
-#> 
-#> Parameters:
-#> $SFO
-#>          Estimate   Pr(>t)    Lower   Upper
-#> parent_0  83.7558 1.80e-14 77.18268 90.3288
-#> k_parent   0.0017 7.43e-05  0.00112  0.0026
-#> sigma      8.7518 1.22e-05  5.64278 11.8608
-#> 
-#> $IORE
-#>                Estimate Pr(>t)    Lower    Upper
-#> parent_0       9.69e+01     NA 8.88e+01 1.05e+02
-#> k__iore_parent 8.40e-14     NA 1.79e-18 3.94e-09
-#> N_parent       6.68e+00     NA 4.19e+00 9.17e+00
-#> sigma          5.85e+00     NA 3.76e+00 7.94e+00
-#> 
-#> $DFOP
-#>          Estimate   Pr(>t)    Lower    Upper
-#> parent_0 9.76e+01 1.94e-13 9.02e+01 1.05e+02
-#> k1       4.24e-02 5.92e-03 2.03e-02 8.88e-02
-#> k2       8.24e-04 6.48e-03 3.89e-04 1.75e-03
-#> g        2.88e-01 2.47e-05 1.95e-01 4.03e-01
-#> sigma    5.36e+00 2.22e-05 3.43e+00 7.30e+00
-#> 
-#> 
-#> DTx values:
-#>      DT50    DT90 DT50_rep
-#> SFO   407    1350      407
-#> IORE  541 5190000  1560000
-#> DFOP  429    2380      841
-#> 
-#> Representative half-life:
-#> [1] 841.41
-  plot(nafta_evaluation)
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