Description Usage Arguments Details Value Note Author(s) References See Also Examples

It measures the extent of overlapping in the flowering periods among pairs of individuals in a population.

1 | ```
SI2(dd, pop, ind)
``` |

`dd` |
Flowering data. |

`pop` |
Research scale, such as Population, individual, inflorescence, single flowers. |

`ind` |
ID ofindividual or inflorescence. |

si=(1/(n-1))*(1/fi)sum(ej);(j=1:n)

`n` |
The number of individuals in the population. |

`fi` |
The number of days individual i was flowering. |

`ej` |
The number of days that individuals i and j are flowering synchronously, with j != i. |

`bij` |
Number of days on which at least one of them (j and/or i) is flowering. |

`si` |
Synchrony index,from 0 (total lack of synchrony) to 1 (perfect synchrony). |

SI2 has been criticized for its dependence on flowering duration because the factor 1/fi increases the level of synchrony when flowering duration decreases.

WANG,XIE

[1]Augspurger, C. K. (1983). Phenology, flowering synchrony and fruit set of six neotropical shrubs. Biotropica 15: 257~267.

nothing

1 2 3 4 5 6 7 8 9 10 11 12 | ```
a1=c(0,1,1,1,0,0,0)
a2=c(0,1,0,1,1,0,0)
a3=c(0,0,0,1,1,1,0)
a4=c(1,0,0,1,1,0,1)
a5=c(0,0,1,1,1,0,1)
a6=c(0,0,0,1,1,1,1)
pop=c("pop1","pop1","pop1","pop2","pop2","pop2")
ind=c(1,2,3,1,2,3)
dd=rbind(a1,a2,a3,a4,a5,a6)
colnames(dd)=c("D5/1","D5/2","D5/3","D5/4","D5/5","D5/6","D5/7")
C=SI2(dd,as.matrix(pop),as.matrix(ind))
C
``` |

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