r - Renaming of Column names in Model.matrix -


can 1 me in renaming of column names of model.matix?

i have been trying rename columns:

colnames(model.matrix(reg))[1] <- c("intercept")

but getting error message:

could not find function "model.matrix<-"

here model.matrix object:

model.matrix.default(reg)    xxxb(intercept) xxxbproductpageviews xxxbqty_order xxxblag.sales 2         1.782842             2352.032      1.804487      303.0831 4         1.782842             1569.158      1.799786      369.0831 5         1.782842             2541.884      1.806206      434.7506 6         1.782842             2932.289      1.811827      414.7104 7         1.782842             2670.780      1.798207      360.4423 8         1.782842             2694.579      1.793033      291.9571 9         1.782842             5435.900      1.791143      325.7292 10        1.782842            10727.969      1.807148      602.7453 11        1.782842            12711.044      1.826717     1130.3189 12        1.782842            10774.425      1.808426     1694.6620 13        1.782842             8597.127      1.789496     1611.1204 14        1.782842             7647.235      1.789358     1161.2223 15        1.782842             5538.071      1.798733      979.3913 16        1.782842             4240.954      1.798549      813.5173 17        1.782842             3890.973      1.787179      668.3082 18        1.782842             4086.364      1.816897      563.1715 19        1.782842             4878.903      1.815232      552.4128 20        1.782842             3999.407      1.787328      612.4691 21        1.782842             3349.887      1.875233      526.7774 22        1.782842             5394.895      1.891263      599.2761 23        1.782842             4682.374      1.817970     1290.7023 24        1.782842             3346.345      1.805635     1057.0534 25        1.782842             3106.214      1.839484      638.3726 26        1.782842             4559.091      1.878944      611.1822 attr(,"assign") [1] 1 1 1 1

the above matrix matrix of lm equation called reg. how can change column names of model.matrix?

you need store model.matrix result first rename columns.

mm <- model.matrix(reg) colnames(mm)[1] <- c("intercept")

more could use gsub replace "xxxb" part names with:

colnames(mm) <- gsub("xxxb","",colnames(mm))

an alternative approach involve following:

`colnames<-`(model.matrix(reg),1:4)

where 1:4 vector of replacement names of appropriate length. think first solution easier (and more flexible), though.


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