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Asked: 2026-05-14T04:46:40+00:00

I am trying to make a faceted plot in ggplot2 of the coefficients on

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I am trying to make a faceted plot in ggplot2 of the coefficients on the regressors from
two linear models with the same predictors. The data frame I constructed is this: 

r.together>
          reg         coef        se      y
1  (Intercept)  5.068608671 0.6990873 Labels
2     goodTRUE  0.310575129 0.5228815 Labels
3    indiaTRUE -1.196868662 0.5192330 Labels
4    moneyTRUE -0.586451273 0.6011257 Labels
5     maleTRUE -0.157618168 0.5332040 Labels
6  (Intercept)  4.225580743 0.6010509  Bonus
7     goodTRUE  1.272760149 0.4524954  Bonus
8    indiaTRUE -0.829588862 0.4492838  Bonus
9    moneyTRUE -0.003571476 0.5175601  Bonus
10    maleTRUE  0.977011737 0.4602726  Bonus

The “y” column is a label for the model, reg are the regressors and coef and se are what you would think.

I want to plot:

g <- qplot(reg, coef, facets=.~y, data = r.together) + coord_flip()

But when I try to display the plot, I get: 

> print(g)
Error in names(df) <- output : 
'names' attribute [2] must be the same length as the vector [1]

What’s strange is that 

qplot(reg, coef, colour=y, data = r.together) + coord_flip()

plots as you would expect.

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1 Answer

  1. Editorial Team

    I don’t know why, but the name y seems to be the problem. If you change it, then it works

    r.together <- read.table(textConnection("
          reg         coef        se      myfactor
 (Intercept)  5.068608671 0.6990873 Labels
    goodTRUE  0.310575129 0.5228815 Labels
   indiaTRUE -1.196868662 0.5192330 Labels
   moneyTRUE -0.586451273 0.6011257 Labels
    maleTRUE -0.157618168 0.5332040 Labels
 (Intercept)  4.225580743 0.6010509  Bonus
    goodTRUE  1.272760149 0.4524954  Bonus
   indiaTRUE -0.829588862 0.4492838  Bonus
   moneyTRUE -0.003571476 0.5175601  Bonus
    maleTRUE  0.977011737 0.4602726  Bonus
"),header=T)

qplot(reg, coef, data = r.together, facets= .~myfactor ) + coord_flip()
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