Description Usage Arguments Details Value References See Also Examples
Compute the median germination time (\mjseqnt_50). Median germination time is the time to reach 50% of final/maximum germination. \loadmathjax
1 
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 
method 
The method for computing median germination time. Either

With argument method
specified as "coolbear"
, median
germination time is computed according to the formula by
\insertCitecoolbear_effect_1984;textualgerminationmetrics as follows.
t_50=T_i+ \frac(\fracN+12N_i)(T_jT_i)N_jN_i
Where, \mjseqnt_50 is the median germination time, \mjseqnN is the final number of germinated seeds, and \mjseqnN_i and \mjseqnN_j are the total number of seeds germinated in adjacent counts at time \mjseqnT_i and \mjseqnT_j respectively, when \mjseqnN_i < \fracN + 12 < N_j.
Similarly with argument method
specified as "farooq"
, median
germination time is computed according to the formula by by
\insertCitefarooq_thermal_2005;textualgerminationmetrics as follows.
t_50=T_i+ \frac(\fracN2N_i)(T_jT_i)N_jN_i
Where, \mjseqnt_50 is the median germination time, \mjseqnN is the final number of germinated seeds, and \mjseqnN_i and \mjseqnN_j are the total number of seeds germinated in adjacent counts at time \mjseqnT_i and \mjseqnT_j respectively, when \mjseqnN_i < \fracN2 < N_j.
The median germination time (\mjseqnt_50) value 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  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)
int < 1:length(x)
# From partial germination counts
#
t50(germ.counts = x, intervals = int, method = "coolbear")
t50(germ.counts = x, intervals = int, method = "farooq")
# From cumulative germination counts
#
t50(germ.counts = y, intervals = int, partial = FALSE, method = "coolbear")
t50(germ.counts = y, intervals = int, partial = FALSE, method = "farooq")

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