Reshape question.

Thank you for you reply. I will try this. The inital few rows in the .dat file look like:

Year,DayOfYear,Sku,Quantity,CatId,Category,SubCategory
2009,1,100051,1,10113,"MEN","Historical men's"
2009,1,100130,1,10638,"ACCESSORIES & MAKEUP","ALL Kids Accessories"
2009,1,100916,1,10222,"WOMEN","TV & Movies Women"
2009,1,101241,1,10897,"HOLIDAY","Colonial (Presidents)"
2009,1,101252,1,10640,"ACCESSORIES & MAKEUP","Finishing Touches"
2009,1,101298,1,10865,"HOLIDAY","Easter"
2009,1,101613,1,10410,"GIRLS","Classic Girls"
2009,1,101645,1,10320,"BOYS","Superheroes Boys"
2009,1,101648,1,10320,"BOYS","Superheroes Boys"
2009,1,101718,1,10897,"HOLIDAY","Colonial (Presidents)"
2009,1,101719,1,10897,"HOLIDAY","Colonial (Presidents)"
2009,1,101751,1,10420,"GIRLS","Superheroes Girls"
2009,1,102125,1,10638,"ACCESSORIES & MAKEUP","ALL Kids Accessories"
2009,1,102174,1,10897,"HOLIDAY","Colonial (Presidents)"
2009,1,102558,1,10636,"ACCESSORIES & MAKEUP","Armor/Weapons/Guns"
2009,1,102582,1,10636,"ACCESSORIES & MAKEUP","Armor/Weapons/Guns"
2009,1,102717,1,10862,"HOLIDAY","Christmas"
2009,1,104705,1,10518,"PLUS","Plus Women"
2009,1,104745,6,10748,"HATS, WIGS & MASKS","Wigs - Men's"
2009,1,104745,1,10748,"HATS, WIGS & MASKS","Wigs - Men's"
2009,1,104751,1,10310,"BOYS","Classic Boys"
2009,1,105238,1,10742,"HATS, WIGS & MASKS","Hats-Miscellaneous"
2009,1,105352,10,10742,"HATS, WIGS & MASKS","Hats-Miscellaneous"
2009,1,107420,10,10744,"HATS, WIGS & MASKS","Masks - Miscellaneous"
2009,1,107420,1,10744,"HATS, WIGS & MASKS","Masks - Miscellaneous"
2009,1,107479,1,10743,"HATS, WIGS & MASKS","Masks - Famous"
2009,1,107479,1,10743,"HATS, WIGS & MASKS","Masks - Famous"

If your propose solution works I am confused as to why during the original I was able to specify:

c2009 <- cast(m2009, DayOfYear ~ variable | Category, sum)
t2009 <- cast(m2009, DayOfYear ~ variable, sum)

By combining this into one 'cast' is it better (as in faster)?

Thanks again.

Kevin

how about:
c2009 <- cast(m2009, Category + SubCategory +DayOfYear ~ variable , sum)
?


p.s: toy data would be nice to have :)






On Wed, Mar 11, 2009 at 9:47 PM, <rkevinburton at charter.net> wrote:

This hopefully is trivial. I am trying to reshape the data using the
reshape package.

First I read in the data:

a2009 <- read.csv("Total2009.dat", header = TRUE)

Then I trim it so that it only contains the columns that I have interested
in:

m2009 <- melt(a2009, id.var=c("DayOfYear","Category","SubCategory","Sku"),
measure.var=c("Quantity"), na.rm=TRUE)

Then I start to formulate the data that I will process:

c2009 <- cast(m2009, DayOfYear ~ variable | Category, sum)

Finally I aggregate the data:

t2009 <- cast(m2009, DayOfYear ~ variable, sum)

My question is on the third step above (repeated here)

c2009 <- cast(m2009, DayOfYear ~ variable | Category, sum)

This gets the data assocated with a unique 'Category' name. I want to get
the data grouped by 'Category' and 'SubCategory'. The 'SubCategory' is not
unique but the combination 'Category' and 'SubCategory' form a unique pair.
What would be the formula that would give me the data grouped by Category
AND SubCategory? Would it be as simple as:

c2009 <- cast(m2009, DayOfYear ~ variable | Category & SubCategory, sum)

?

Thank you for your suggestions.

Kevin

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