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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