R help - Mar 2013 - How to make the labels of pie chart are not overlapping?

I have the following dataframe:

Product    predicted_MarketShare  Predicted_MS_Percentage
A                    2.827450e-02                             2.8
B                    4.716403e-06                             0.0
C                    1.741686e-01                             17.4
D                   1.716303e-04                             0.0
.......

Because there are so many products, and most of predicted Market share is around
0%.
When I make pie chart, the labels of those product with 0% market share are
overlapping.
How do I make the labels are not overlapping?

Kind regards.
Tammy
 		 	   		  
	[[alternative HTML version deleted]]

Simple -- don't make a pie chart.

-- Bert

(Seriously -- this is an awful display. Consider, instead, a bar plot
plotting cumulative sums of percentages with products/bars ordered from
largest percentage to smallest; or plotting just the percentages in that
order, depending on which is more informative.)

On Fri, Mar 15, 2013 at 6:58 AM, Tammy Ma <metal_licaling@live.com> wrote:
> I have the following dataframe:
>
> Product    predicted_MarketShare  Predicted_MS_Percentage
> A                    2.827450e-02                             2.8
> B                    4.716403e-06                             0.0
> C                    1.741686e-01                             17.4
> D                   1.716303e-04                             0.0
> .......
>
> Because there are so many products, and most of predicted Market share is
> around 0%.
> When I make pie chart, the labels of those product with 0% market share
> are overlapping.
> How do I make the labels are not overlapping?
>
> Kind regards.
> Tammy
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
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>


-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

	[[alternative HTML version deleted]]

On 03/16/2013 12:58 AM, Tammy Ma wrote:
> I have the following dataframe:
>
> Product    predicted_MarketShare  Predicted_MS_Percentage
> A                    2.827450e-02                             2.8
> B                    4.716403e-06                             0.0
> C                    1.741686e-01                             17.4
> D                   1.716303e-04                             0.0
> .......
>
> Because there are so many products, and most of predicted Market share is
around 0%.
> When I make pie chart, the labels of those product with 0% market share are
overlapping.
> How do I make the labels are not overlapping?
>
Hi Tammy,
Obviously you have many more products than are shown above. Let us 
assume that their market share is distributed approximately as negative 
binomial and your "C" value is the maximum. You might have twenty 
products with market shares around:

market_share<-c(0,0,0,0,1,1,1,1,2,2,3,3,4,5,5,6,10,11,15,17)
names(market_share)<-LETTERS[1:20]

If you try to plot this as a pie chart:

pie(market_share)

you do get a bunch of overprinted labels for the four zero values. Pie 
charts with more than four or five sectors are usually not the best way 
to display the distribution of your values, but if you must:

par(mar=c(5,4,4,4))
pie(market_share,labels=c(rep("",4),names(market_share)[5:20]))
par(xpd=TRUE)
text(1.1,0,"A,B,C,D=0")
par(xpd=FALSE)

Good luck with it.

Jim