Richard, It is now working.
Thank you very much. Bob On 12/18/2018 7:10 PM, Richard M. Heiberger wrote:
## This example, with your variable names, works correctly. z2 <- data.frame(y=1:5, x=c(1,5,2,3,5), x2=c(1,5,2,3,5)^2) z2 class(z2) length(z2) dim(z2) lm(y ~ x + x2, data=z2) ## note that that variable names y, x, x2 are column names of the ## data.frame z2 ## please review the definitions and examples of data.frame in ?data.frame ## also the argument requirements for lm in ?lm On Tue, Dec 18, 2018 at 6:32 PM rsherry8 <rsher...@comcast.net> wrote:The values read into z2 came from a CSV file. Please consider this R session: > length(x2) [1] 1632 > length(x) [1] 1632 > length(z2) [1] 1632 > head(z2) [1] 28914.0 28960.5 28994.5 29083.0 29083.0 29083.0 > tail(z2) [1] 32729.65 32751.85 32386.05 32379.75 32379.15 31977.15 > lm ( y ~ x2 + x, z2 ) Error in eval(predvars, data, env) : numeric 'envir' arg not of length one > lm ( y ~ x2 + x, as.data.frme(z2) ) Error in as.data.frme(z2) : could not find function "as.data.frme" > lm ( y ~ x2 + x, as.data.frame(z2) ) Error in eval(predvars, data, env) : numeric 'envir' arg not of length one lm(formula = y ~ x2 + x, data = as.data.frame(z2)) Coefficients: (Intercept) x2 x -1.475e-09 1.000e+00 6.044e-13 > min(z2) [1] 24420 > max(z2) [1] 35524.85 > class(z2) [1] "numeric" > where x is set to x = seq(1:1632) and x2 is set to x^2 I am looking for an interpolating polynomial of the form: Ax^2 + Bx + C I do not think the results I got make sense. I believe that I have a data type error. I do not understand why I need to convert z2 to a data frame if it is already numeric. Thanks, Bob ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
