On Sat, Apr 2, 2011 at 7:59 PM, David Winsemius wrote:
>
> On Apr 2, 2011, at 10:20 PM, Joshua Wiley wrote:
>> VA <- cbind(OS = c(.2, 0, 1, -.1, NA, 3, NA),
>> OD = c(.3, -.1, .2, -.1, NA, 0, .1),
>> Desired = c(0.225, -0.075, 0.4, -0.1, NA, 0.75, 0.1))
>
> VA <- cbind(VA, 0.75*pmin(VA[, "OS"],
On Apr 2, 2011, at 10:20 PM, Joshua Wiley wrote:
Dear List,
I am trying to take the weighted average of two numbers (visual acuity
measures from the left and right eye). For each row, the lowest value
should get a weight of .75, and the highest a weight of .25. My
problem is, if one value i
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