Dennis,
Thank you for your response. For clarification, I was not expecting
table() to divinely figure out the intent that I was making two levels
out of one (given my character vectors). Since table() is a generic
function that behaves differently with character and factor vectors, I
needed a way to convert the data I had to get the desired behavior.
Your factor() statements will accomplish my goal of putting zeros into
contingency tables.
Regards,
Na'im
Quoting "Dennis Murphy" <djmu...@gmail.com>:
Hi,
table() is behaving as documented with respect to your example. local.labels
is a *character* vector with two distinct values and local.preds is a
*character* variable with one distinct value. If you were expecting your
table to divine that you wanted to include 'ah~' as a missing value in your
local.preds object, it's not going to happen under your current setup.
local.labels <- c("ah", "ah", "ah~")
local.preds <- c("ah", "ah", "ah")
table(local.labels, local.preds)
local.preds
local.labels ah
ah 2
ah~ 1
class(local.labels)
[1] "character"
class(local.preds)
[1] "character"
Is this what you had in mind?
labels <- factor(local.labels)
preds <- factor(local.preds, levels = c('ah', 'ah~'))
table(labels, preds)
preds
labels ah ah~
ah 2 0
ah~ 1 0
labels
[1] ah ah ah~
Levels: ah ah~
preds
[1] ah ah ah
Levels: ah ah~
There is a distinction in R between character objects and factor objects.
More generally, many [generic] functions behave differently depending on the
type of object(s) supplied as input.
HTH,
Dennis
On Wed, Jul 28, 2010 at 10:29 PM, Na'im R. Tyson
<nty...@clovermail.net>wrote:
R-philes,
I have a question about displaying counts of unused factors using the
table() function. I have two vectors with character data in them:
local.labels("ah", "ah", "ah~")
local.preds("ah", "ah", "ah")
If I use the table function as shown below, I get an error because the
number of levels do not match up.
v.cont.table <- table(local.labels, local.preds, dnn=c("observed",
"predicted"));
Is there any way to get zero counts into the contingency table, or would I
have to use a flat table? Any help with sample code, or a pointer to a
previous post, would be much appreciated.
Regards,
Na'im
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