Displaying 20 results from an estimated 23 matches for "mpearmain".
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pearmain
2008 Jun 06
2
Merging two dataframes
Hi All,
Newbie question for you all but i have been looking at the archieves and the
help dtuff to get a rough idea of what i want to do
I would like to merge two dataframes together based on a keyed variable in
one dataframe linking to the other dataframe. Only some of the cases will
match but i would like to keep the others as well.
My dataframes have 67 and 28 cases respectively and i would
2008 Dec 05
1
Loop swith String replacement
...hrome 60 12 0.2253 0 2
15 Chrome 24 14 4.3348 1 3
--
Michael Pearmain
Senior Analytics Research Specialist
Google UK Ltd
Belgrave House
76 Buckingham Palace Road
London SW1W 9TQ
United Kingdom
t +44 (0) 2032191684
mpearmain@google.com
If you received this communication by mistake, please don't forward it to
anyone else (it may contain confidential or privileged information), please
erase all copies of it, including all attachments, and please let the sender
know it went to the wrong person. Thanks.
[[alternativ...
2009 Aug 25
1
Help with nls and error messages singular gradient
...anks in advance
Mike
--
Michael Pearmain
Senior Analytics Research Specialist
“Statistics are like women; mirrors of purest virtue and truth, or like
whores to use as one pleases”
Google UK Ltd
Belgrave House
76 Buckingham Palace Road
London SW1W 9TQ
United Kingdom
t +44 (0) 2032191684
mpearmain@google.com
If you received this communication by mistake, please don't forward it to
anyone else (it may contain confidential or privileged information), please
erase all copies of it, including all attachments, and please let the sender
know it went to the wrong person. Thanks.
[[alternativ...
2008 Jun 17
2
Calling functions
Another newbie question.
I've written a function and saved the file as Xtabs.R, in a central place on
a network so others will be able ot use the function,
My question is how do i call this function?
I've tried to chance the working directory, and tried to load it via;
> library(Xtabs, lib.loc="//filer/common/technical/surveys/R_test")
but neither seem to work? the function
2008 Dec 31
3
Paste in a FOR loop
Hi All,
I've been having a little trouble using R2HTML and a loop, but can't figure
out where the problem lies, any hints gratefully received.
My code at the minute, (Which does work) is in the following:
library(R2HTML)
HTMLStart(outdir =
file.path("C://Example_work","R_projects","Dynamic_creative"),filename =
"RMDC_mockup",Title="Mock up for
2008 Aug 05
2
Selecting Variables
Hi All,
i have a dataset that i want to dynamically inspect for the number of
variables that start with "Exposure_" and then for these count the entries
across each case i.e
ID Exposure_1 Exposure_2 Exposure_3
1 y y y
2 y y -
3 y - -
So the corresponding new variables
2009 Sep 15
2
Viewing Function Code
...ages. I like the individual case. A man may have six meals
one day and none the next, making an average of three meals per day, but
that is not a good way to live. ~Louis D. Brandeis"
Google UK Ltd
Belgrave House
76 Buckingham Palace Road
London SW1W 9TQ
United Kingdom
t +44 (0) 2032191684
mpearmain@google.com
If you received this communication by mistake, please don't forward it to
anyone else (it may contain confidential or privileged information), please
erase all copies of it, including all attachments, and please let the sender
know it went to the wrong person. Thanks.
[[alternativ...
2008 Jun 20
2
Problems with basic loop
I'm having trouble creating a looping variable and i can't see wher ethe
problem arises from any hep gratfully appreciated
First create a table
x<-table(SURVEY$n_0,exposed)
> x
exposed
False True
Under 16 24 1
16-19 68 9
20-24 190 37
25-34 555 204
35-44 330 87
45-54 198 65
55-64 67 35
65+
2008 Oct 13
2
Timestamps and manipulations
Hi All,
I've a couple of questions i've been struggling with using the time
features, can anyone help? sample data
Timestamp user_id
27/05/08 22:57 763830873067 27/05/08 23:00 763830873067 27/05/08 23:01
763830873067 27/05/08 23:01 763830873067 05/06/08 11:34 763830873067
29/05/08
23:08 765253440317 29/05/08 23:06 765253440317 29/05/08 22:52
765253440317
2008 Oct 02
1
Time conversion
...p,"%d-%m-%y-%H:%M:%S")
## then filter on the datetime
time<-ifelse(timestamp> "07-08-2008-00:00:00", TRUE, FALSE)
--
Michael Pearmain
Senior Statistical Analyst
Google UK Ltd
Belgrave House
76 Buckingham Palace Road
London SW1W 9TQ
United Kingdom
t +44 (0) 2032191684
mpearmain@google.com
If you received this communication by mistake, please don't forward it to
anyone else (it may contain confidential or privileged information), please
erase all copies of it, including all attachments, and please let the sender
know it went to the wrong person. Thanks.
[[alternativ...
2008 Oct 15
1
comparing with lead function
Hi All,
I've been trying to compare if the previous value in a variable is equal to
a binary value..(i.e i want to check if the last event was a yes or no)
i've been trying to write some code for this, but it seems overly elaborate,
can anyone suggest a better / shorter / neater way?
The below doesn't quite work but shows my idea of splitting by the factor
id, then creating a new
2009 Mar 11
1
Forecasting with dlm
Hi All,
I have a problem trying to forecast using the dlm package, can anyone offer
any advise?
I setup my problem as follows, (following the manual as much as possible)
data for example to run code
CostUSD <- c(27.24031,32.97051, 38.72474, 22.78394, 28.58938, 49.85973,
42.93949, 35.92468)
library(dlm)
buildFun <- function(x) {
dlmModPoly(1, dV = exp(x[1]), dW = exp(x[2]))
}
fit <-
2008 Jun 09
1
Missing Data and applying
Hi All,
Newbie question that i'm sure is easy, but i can't seem to apply properly
I read in a datafram from a CSV file and i want to tell R that from coloum
"n_0" to "n_32" the value "-1" is missing data
i was looking at the
is.na(xx) <- c(..,...,) idea but i can't seem to apply it properly, can
anyone offer advice?
On a side issue while i'm
2010 Jan 22
1
Title splitting function
Hi All,
I'm trying to write a function to automatically split long strings so they
will appear nicely in a chart i'm trying to create,
Say i have a string
title <- "some variety of words that are descriptive"
In this instance i want to place carriage return where there is a space just
prior to a specified number of characters (in this case 15)
title.length <-
2008 Sep 23
2
Contional
Hi All,
I'm having trouble selecting rows to delete, that i can't seem to overcome.
Below is some sample data, i am trying to dedup the data based on each user,
and simultaneously the timestamp (at the side i have highlighted expected
row to be removed)
I've looked at the lag function but can't seem to make it work?
My logic ran along the lines of an ifelse statement and then
2009 Oct 12
1
List mappings and variable creation
Hi All,
I have a questions about associative list mappings in R, and if they are
possible?
I have data in the form show below, and want to make a new 'bucket' variable
called combined. Which is the sum of the control and the exposed metric
values
This combined variable is a many to many matching as values only appear in
the file if they have a value > 0.
conversion.type filteredID
2009 Jan 28
2
t.test in a loop
..., "~channel.data.train$power",
:
variable "channel.data.train$News~channel.data.train$power" was not found
--
Michael Pearmain
Senior Analytics Research Specialist
Google UK Ltd
Belgrave House
76 Buckingham Palace Road
London SW1W 9TQ
United Kingdom
t +44 (0) 2032191684
mpearmain@google.com
If you received this communication by mistake, please don't forward it to
anyone else (it may contain confidential or privileged information), please
erase all copies of it, including all attachments, and please let the sender
know it went to the wrong person. Thanks.
[[alternativ...
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$Id)
Will give me c(1,2), but not accompanied by the name column.
2008 Jun 17
1
Z test and proportions
Hi All,
I have a table based on ordial data and i want to compare proportions and
i've seen in the pwr package i can use
power.prop.test
however i want to find out what the sig. value is based on n1,n2,p1,p2 and
this package doesn't contain this..
Does anyone know of a package that does or is it a case of writting a
function specifically for this?
Many thanks in advance
[[alternative
2008 Aug 13
0
Flag variable
Hi All,
I have 4000 case which have string variables in them, i want to do some
fuzzy matching and create a new variable that is of the same length with 0
or 1's
if i use the code
test<- agrep("web Klick",ETC$Exposure.Type , max = 2, ignore.case = TRUE)
it works but i get
> length(test)
[1] 3127
This returns the case values that do match, can someone tell me how to match
this