Because of regulatory requirement changes over several decades and weather conditions preventing site access the variables in my data set have different lengths. I'd like guidance on how to perform linear regressions and other models with these variables.
For example, there are 2206 rows for the parameter "TDS" but only 1191 rows for the parameter "Cond." Such discrepancies are common in these data. Is there a reference I can read to learn how to analyze such data? Rich ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
