germinationmetrics (version 0.1.8)

WeightGermPercent: Weighted germination percentage

Description

Compute the Weighted germination percentage WGP or Weighted germination index WGI reddy_effect_1978,reddy_effect_1985germinationmetrics.

Usage

WeightGermPercent(germ.counts, total.seeds, intervals, partial = TRUE)

Value

The weighted germination percentage (%) value.

Arguments

germ.counts

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

total.seeds

Total number of seeds tested.

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

Weighted germination percentage was calculated by giving maximum weight to the seeds that germinate first and decreasing weight to the seeds that germinate subsequently. It is computed as follows reddy_effect_1978,reddy_effect_1985germinationmetrics.

WGP = _i=1^k(k-i+1)N_ik N 100

Where, N_i is the number of seeds that germinated in the time interval i (not cumulative, but partial count), N is the total number of seeds tested, and k is the total number of time intervals.

References

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
#----------------------------------------------------------------------------
WeightGermPercent(germ.counts = x, total.seeds = 50, intervals = int)

# From cumulative germination counts
#----------------------------------------------------------------------------
WeightGermPercent(germ.counts = y, total.seeds = 50, intervals = int,
                  partial = FALSE)