Using library-alr4 in R environment-Data file-galapagos

Galpagos Islands (Data file: galapagos) The Galpagos Islands off the coast of Ecuador provide an excellent laboratory for studying the factors that influence the development and survival of different species. Johnson and Raven (1973) have presented data in the file the number of species that occur only on that one island (the endemic species). Use these data to find factors that influence diversity, as measured by some function of the number of species and the number of endemic species, and summarize your results. One complicating factor is that elevation is not recorded for six very small islands, so some provision must be made for this. Four possibilities are (1) find the elevations; (2) delete these six islands from the data; (3) ignore elevation as a predictor of diversity, or (4) substitute a plausible value for the missing data. Examination of large-scale maps suggests that none of these elevations exceed 200 m.