Description Usage Arguments Details Value References Examples

View source: R/FirstGermTime.R

Compute the following metrics:

`FirstGermTime`

Time of first germination or Germination time lag (\mjseqnt_0) \insertCiteedwards_temperature_1932,czabator_germination_1962,goloff_germination_1975,labouriau_germinacao_1983,ranal_effects_1999,quintanilla_effect_2000germinationmetrics.

`LastGermTime`

Time of last germination (\mjseqnt_g) \insertCiteedwards_temperature_1932,labouriau_germinacao_1983,ranal_how_2006germinationmetrics.

`TimeSpreadGerm`

Time spread of germination \insertCiteal-mudaris_notes_1998,kader_comparison_2005germinationmetrics or Germination distribution \insertCiteschrader_seed_2000germinationmetrics.

`PeakGermTime`

Peak time of germination or Modal time of germination \insertCiteranal_how_2006germinationmetrics.

1 2 3 4 5 6 7 | ```
FirstGermTime(germ.counts, intervals, partial = TRUE)
LastGermTime(germ.counts, intervals, partial = TRUE)
PeakGermTime(germ.counts, intervals, partial = TRUE)
TimeSpreadGerm(germ.counts, intervals, partial = TRUE)
``` |

`germ.counts` |
Germination counts at each time interval. Can be partial
or cumulative as specified in the argument |

`intervals` |
The time intervals. |

`partial` |
logical. If |

Time of first germination indicates time of germination of the faster seeds in a seedlot.

Lower value of time of first germination indicates faster initiation of germination and lower value of time of last germination indicates faster termination of germination.

Time spread of germination (\mjseqnt_g-t_0) indicates difference between faster and slower germinating members of a sample.

Peak time of germination is the time in which highest frequency of germinated seeds are observed. Multiple peak times of germination are possible and if detected are indicated by a warning message.

For `FirstGermTime`

, the time of first germination value in the
same unit of time as specified in the argument `intervals`

.

For `LastGermTime`

, the time of last germination value in the same
unit of time as specified in the argument `intervals`

.

For `TimeSpreadGerm`

, the time spread of germination value in the same
unit of time as specified in the argument `intervals`

.

For `PeakGermTime`

, the time(s) of peak germination value(s) as a
numeric vector in the same unit of time as specified in the argument
`intervals`

.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ```
x <- c(0, 0, 0, 0, 4, 17, 10, 7, 1, 0, 1, 0, 0, 0)
y <- c(0, 0, 0, 0, 4, 21, 31, 38, 39, 39, 40, 40, 40, 40)
z <- c(0, 0, 0, 0, 11, 11, 9, 7, 1, 0, 1, 0, 0, 0)
int <- 1:length(x)
# From partial germination counts
#----------------------------------------------------------------------------
FirstGermTime(germ.counts = x, intervals = int)
LastGermTime(germ.counts = x, intervals = int)
TimeSpreadGerm(germ.counts = x, intervals = int)
PeakGermTime(germ.counts = x, intervals = int)
# For multiple peak germination times
PeakGermTime(germ.counts = z, intervals = int)
# From cumulative germination counts
#----------------------------------------------------------------------------
FirstGermTime(germ.counts = y, intervals = int, partial = FALSE)
LastGermTime(germ.counts = y, intervals = int, partial = FALSE)
TimeSpreadGerm(germ.counts = y, intervals = int, partial = FALSE)
PeakGermTime(germ.counts = y, intervals = int, partial = FALSE)
# For multiple peak germination time
PeakGermTime(germ.counts = cumsum(z), intervals = int, partial = FALSE)
``` |

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