Following the message of Bert Gunter, you should explain better what you have done (not everyone know that describeBy is a function of psych package) and what you want. You said "error bars"... but what "error bar"? (I don't like the term "error bars". Most often they are not errors but dispersion bar; if you read French, you can check this ppt from a conference I gave : Myths and legends in statistics : http://max2.ese.u-psud.fr/epc/conservation/Publi/Mythes.pdf

Here is a reproducible example, and it works:
> library("psych")
> df <- data.frame(A=rnorm(10, 10, 2), B=rnorm(10, 9, 3), C=sample(c("G", "H"), 10, replace=TRUE))
> d <- describeBy(df[, c("A", "B")], group=df$C)
> error.crosses(d$G, d$H)

Sincerely

Marc Girondot


Le 27/04/2016 20:54, Marlin Keith Cox a écrit :
Hello all, I have used describeBy to generate the following summary
statistics.  I simply need x and y error bars on a plot that has CQN
(xaxis) and Price (yaxis).  There should be four total points on the graph
(one for each supplier).

Using "error.crosses(desc$CQN, desc$Price)" does not work.



group: a
           vars  n  mean    sd median trimmed   mad   min   max range skew
CQN          1 65 48.22 11.12  49.61   47.86 13.79 31.30 72.71 41.41  0.1
Price        2 65  6.65  0.06   6.69    6.66  0.01  6.48  6.70  0.22 -1.2
Supplier*    3 65   NaN    NA     NA     NaN    NA   Inf  -Inf  -Inf   NA
           kurtosis   se
CQN          -1.01 1.38
Price         0.70 0.01
Supplier*       NA   NA
------------------------------------------------------------
group: b
           vars n  mean sd median trimmed mad   min   max range skew
kurtosis se
CQN          1 1 91.93 NA  91.93   91.93   0 91.93 91.93     0   NA
NA NA
Price        2 1  6.95 NA   6.95    6.95   0  6.95  6.95     0   NA
NA NA
Supplier*    3 1   NaN NA     NA     NaN  NA   Inf  -Inf  -Inf   NA
NA NA
------------------------------------------------------------
group: c
           vars n  mean   sd median trimmed  mad   min   max range skew
kurtosis
CQN          1 6 63.11 2.58  62.04   63.11 1.53 60.66 67.19  6.53 0.55
  -1.68
Price        2 6  8.92 0.00   8.92    8.92 0.00  8.92  8.92  0.00  NaN
  NaN
Supplier*    3 6   NaN   NA     NA     NaN   NA   Inf  -Inf  -Inf   NA
   NA
             se
CQN       1.05
Price     0.00
Supplier*   NA
------------------------------------------------------------
group: d
           vars n  mean  sd median trimmed  mad   min   max range skew
kurtosis
CQN          1 6 47.20 5.7  46.31   47.20 7.17 39.52 54.45 14.93 0.08
  -1.79
Price        2 6  7.17 0.0   7.17    7.17 0.00  7.17  7.17  0.00  NaN
  NaN
Supplier*    3 6   NaN  NA     NA     NaN   NA   Inf  -Inf  -Inf   NA
NA
             se
CQN       2.33
Price     0.00
Supplier*   NA

M. Keith Cox, Ph.D.
Principal
MKConsulting
17415 Christine Ave.
Juneau, AK 99801
U.S. 907.957.4606

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