[R] Non-uniformly distributed plot

[David Winsemius]

On Dec 23, 2010, at 6:41 PM, David Winsemius wrote:

>
> On Dec 23, 2010, at 5:55 PM, Eric Hu wrote:
>
>> Thanks David. I am reposting the data here.
>
> Jorge has already responded masterfully. He's apparently less lazy  
> that I and did all the editing. A log transformation as he  
> illustrated can be very useful with bivariate skewed distributions.  
> The only variation I would have suggested would be to record the  
> default par settings and restore them at the end.

You could also repeat the plot an use abline to look at the predicted  
values

plot(x,y, log="xy")
lines( log(x), fit$predicted)

It's complementary to the residual plot and the QQ plot in the plot.lm  
display for consideration of the possibility that this may not be a  
truly log-log-linear relationship.


>
> -- 
> David
>>
>> Eric
>>
>>
>>> Hi,
>>>
>>> I would like to plot a linear relationship between variable x and y.
>>> Can anyone help me with scaled plotting and axes so that all data
>>> points can be visualized somehow evenly? Plaint plot(x,y) will
>>> generate condensed points near (0,0) due to several large data
>>> points. Thank you.
>>>
>>> Eric
>>>
>>>
>>> dput(x)
>> c(0.349763, 3.39489, 1.52249, 0.269066, 0.107872, 0.0451689,
>> 0.590268, 0.275755, 0.751845, 1.00599, 0.652409, 2.80664, 0.0269933,
>> 0.137307, 0.282939, 1.23008, 0.436429, 0.0555626, 1.10624, 53,
>> 1.30411, 1.29749, 53, 3.2552, 1.189, 2.23616, 1.13259, 0.505039,
>> 1.05812, 1.18238, 0.500926, 1.0314, 0.733468, 3.13292, 1.26685,
>> 3.10882, 1.01719, 0.13096, 0.0529692, 0.418408, 0.213299, 0.536631,
>> 1.82336, 1.15287, 0.192519, 0.961295, 51, 0.470511, 4.05688,
>> 1.78098, 0.364686, 1.24533)
>>> dput(y)
>> c(0.423279, 0.473681, 0.629478, 1.09712, 0.396239, 0.273577,
>> 0.303214, 0.628386, 0.465841, 0.687251, 0.544569, 0.635805, 0.358983,
>> 0.16519, 0.366217, 1.08421, 0.668939, 0.181861, 0.782656, 13.3816,
>> 1.15256, 0.965943, 20, 2.86051, 0.304939, 1.94654, 0.967576,
>> 0.647599, 0.520811, 1.27434, 0.363666, 0.93621, 0.544573, 0.696733,
>> 1.0031, 3.78895, 0.694053, 0.289111, 0.178439, 0.746576, 0.391725,
>> 0.363901, 1.20297, 0.461934, 0.364011, 0.691368, 20, 0.81947,
>> 1.69594, 1.56381, 0.900398, 0.960948)
>
> David Winsemius, MD
> West Hartford, CT
>
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David Winsemius, MD
West Hartford, CT