[R] Average Login based on date

[David Winsemius]

On May 1, 2010, at 2:07 PM, Mohan L wrote:

> Hi All,
>
> I have the data like this :
>
>> sample <- read.csv(file="sample.csv",sep=",",header=TRUE)
>> sample
>
>     stdate Domain    sex age Login
> 1  01/11/09    xxx FeMale  25     2
> 2  01/11/09    xxx FeMale  35     4
> 3  01/11/09    xxx   Male  18    30
> 4  01/11/09    xxx   Male  31     3
> 5  02/11/09    xxx   Male  32    11
> 6  02/11/09    xxx   Male  31     1
> 7  02/11/09    xxx FeMale  29     1
> 8  02/11/09    xxx FeMale  23     5
> 9  03/11/09    xxx FeMale  25     9
> 10 03/11/09    xxx FeMale  35     6
> 11 03/11/09    xxx   Male  18     3
> 12 03/11/09    xxx   Male  31     0
> 13 04/11/09    xxx   Male  32    25
> 14 04/11/09    xxx   Male  31     1
> 15 04/11/09    xxx FeMale  29     0
> 16 01/11/09    yyy FeMale  25     2
> 17 01/11/09    yyy FeMale  35     4
> 18 01/11/09    yyy   Male  18    30
> 19 01/11/09    yyy   Male  31     3
> 20 02/11/09    yyy   Male  32    11
> 21 02/11/09    yyy   Male  31     1
> 22 02/11/09    yyy FeMale  29     1
> 23 02/11/09    yyy FeMale  23     5
> 24 03/11/09    yyy FeMale  25     9
> 25 03/11/09    yyy FeMale  35     6
> 26 03/11/09    yyy   Male  18     3
> 27 03/11/09    yyy   Male  31     0
> 28 04/11/09    yyy   Male  32    25
> 29 04/11/09    yyy   Male  31     1
> 30 04/11/09    yyy FeMale  29     0
>
> I need to fine the average login on 01/11/09 and 02/11/09 etc...  
> like below

avglog <- with(sample, tapply(Login, stdate, mean) )

>
> stdate          AverageLogin
> 01/11/09          9.75
> 02/11/09           .....
> 03/11/09          .......
>
> How do I find the average Login based on date?
>
> Thanks for your time.
> Mohan L
>
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>
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David Winsemius, MD
West Hartford, CT