Displaying 3 results from an estimated 3 matches for "traveltim".
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traveltime
2010 Oct 17
1
unbalanced repeated measurements Anova with mixed effects
...a data frame (because the trips without
accidents, don't have all the different types of traffic information).
As far as my limited statical knowledge goes, this implies I have a
mixed repeated measurements experiment. To be able to answer the
hypotheses that traffic information influences traveltime, delay and
number of junctions, I can do an Anova. However, the datasets are also
unbalanced, because not all trips lead to the right destination.
I've found that the car package presents the proper tools to do this,
but I'm not sure if the following model will give the results I want...
2010 Jan 16
2
Extracing only Unique Rows based on only 1 Column
...bout the
uniqueness of the values in the other four rows, only the uniqueness
of the entries in the first row. The "unique" command does not seem to
have this option available, at least based on what I've read in the
help file.
A simplified example matrix (designated as "traveltimes"):
ID Time1 Time2
1 3 4
1 4 7
2 3 5
2 5 6
3 4 5
3 2 8
When I use a command such as
matches <- unique(traveltimes, incomparables = FALSE, fromLast = FALSE)
I will end up with a 6-row matrix, exactly what I already have. What I
would like to d...
2009 Nov 09
3
How to transform the Matrix into the way I want it ???
Hi, R users,
I'm trying to transform a matrix A into B (see below). Anyone knows how to
do it in R? Thanks.
Matrix A (zone to zone travel time)
zone z1 z2 z3 z1 0 2.9 4.3 z2 2.9 0 2.5 z3 4.3 2.5 0
B:
from to time z1 z1 0 z1 z2 2.9 z1 z3 4.3 z2 z1 2.9 z2 z2 0 z2 z3 2.5 z3 z1
4.3 z3 z2 2.5 z3 z3 0
The real matrix I have is much larger, with more than 2000 zones. But I
think it should