Displaying 3 results from an estimated 3 matches for "observatio".
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observation
2008 Jun 07
2
Predicting a single observatio using LME
When I use a model fit with LME, I get an error if I try to use "predict" with a dataset consisting of a single line.
For example, using this data:
> simpledata
Y t D ID
1 -1.464740870 1 0 1
2 1.222911373 2 0 1
3 -0.605996798 3 0 1
4 0.155692707 4 0 1
5 3.849619772 1 0 2
6 4.289213902 2 0 2
7 2.369407737 3 0 2
8 2.249052533 4 0 2
9 0.920044316 1
2013 Jun 07
4
matched samples, dataframe, panel data
I R-helpers
#I have a data panel of thousands of firms, by year and industry and
#one dummy variable that separates the firms in two categories: 1 if the firm have an auditor; 0 if not
#and another variable the represents the firm dimension (total assets in thousand of euros)
#I need to create two separated samples with the same number os firms where
#one firm in the first have a corresponding
2008 Jun 06
6
Subsetting to unique values
I want to take the first row of each unique ID value from a data frame.
For instance
> ddTable <-
data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry"))
I want a dataset that is
Id Name
1 Paul
2 Bob
> unique(ddTable)
Will give me all 4 rows, and
> unique(ddTable$Id)
Will give me c(1,2), but not accompanied by the name column.