An observational study was conducted to explore the relationship between seed production and plant characteristics in rye-grass. Between 17 and 24 samples were collected at each of four study sites (Site: C, L, P, and W). For each sample point, the total number of seeds per square meter (TotalSeed), the average head length in millimeters (HLength), and the average number of spikelets per head (Spikelets) were measured. This dataset facilitates analysis of how head length and spikelet count may influence seed yield across multiple field sites.
Format
A data frame with 5 variables: Sample, Site, HLength, Spikelets, TotalSeed.
- Sample
Factor. Unique identifier for each sample point.
- Site
Factor. Study site where the sample was collected (levels: "C", "L", "P", "W").
- HLength
Numeric. Average head length of rye-grass plants at the sampling point (in millimeters, mm).
- Spikelets
Numeric. Average number of spikelets per head at the sampling point.
- TotalSeed
Integer. Total number of seeds per square meter at the sampling point.
Source
Welham, S. J., Gezan, S. A., Clark, S. J., and Mead, A. (2015) Statistical Methods in Biology: Design and analysis of experiments and regression
Examples
anova(lm(log10(TotalSeed) ~ Site * (HLength + Spikelets) , data = weedseed))
#> Analysis of Variance Table
#>
#> Response: log10(TotalSeed)
#> Df Sum Sq Mean Sq F value Pr(>F)
#> Site 3 13.2175 4.4058 108.2169 < 2e-16 ***
#> HLength 1 0.2905 0.2905 7.1363 0.00926 **
#> Spikelets 1 0.1554 0.1554 3.8170 0.05446 .
#> Site:HLength 3 0.2092 0.0697 1.7127 0.17162
#> Site:Spikelets 3 0.0797 0.0266 0.6524 0.58392
#> Residuals 75 3.0535 0.0407
#> ---
#> Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1