germinationmetrics (version 0.1.8)

CUGerm: Coefficient of uniformity of germination

Description

Compute the Coefficient of uniformity of germination (CUG).

Usage

CUGerm(germ.counts, intervals, partial = TRUE)

Value

The value of the coefficient of uniformity of germination as

time^-2.

Arguments

germ.counts

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

intervals

The time intervals.

partial

logical. If TRUE, germ.counts is considered as partial and if FALSE, it is considered as cumulative. Default is TRUE.

Details

CUG is computed as follows heydecker_seed_1972,bewley_seeds_1994germinationmetrics.

CUG = _i=1^kN_i_i=1^k(T-T_i)^2N_i

Where, T is the the mean germination time, T_i is the time from the start of the experiment to the ith interval, N_i is the number of seeds germinated in the ith time interval (not the accumulated number, but the number corresponding to the ith interval), and k is the total number of time intervals.

References

See Also

GermSynchrony, MeanGermTime

Examples

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
#----------------------------------------------------------------------------
CUGerm(germ.counts = x, intervals = int)

# From cumulative germination counts
#----------------------------------------------------------------------------
CUGerm(germ.counts = y, intervals = int, partial = FALSE)