Conducting a t-test through the OpenCPU platform

My attempt to utilize the t-test in R using OpenCPU looked like this -

<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="//cdn.opencpu.org/opencpu-0.4.js"></script>

and 

ocpu.seturl("//public.opencpu.org/ocpu/library/stats/R")

var x = [1,2,3,4,5,6,7,8,9,10];
var y = [7,8,9,10,11,12,13,14,15,16,17,18,19,20];
// call R function: stats::t.test
var req = ocpu.rpc("t.test",{
    "x" : x,
    "y" : y
}, function(output){
    alert("t.test equals: " + output);
});

//optional
req.fail(function(){
    alert("R returned an error: " + req.responseText);
});

Unfortunately, I encountered this error

https://i.sstatic.net/yUG43.png

I am perplexed by where I might be making a mistake

javascriptrstatisticsopencpu

Answer №1

The function ocpu.rpc is a convenient way to fetch output in JSON format. However, when dealing with a t.test object, there is no direct JSON representation available. In such cases, it is recommended to use the ocpu.call function and retrieve the console output from the session. Check out this example on [fiddle]:

var req = ocpu.call("t.test",{
    x : x,
    y : y
}, function(session){
  session.getConsole(function(outtxt){
      $("code").text(outtxt);
  });
});

If you require specific data like p-values, consider creating a simple R package with a wrapper function that returns the desired data in a list format:

my_ttest <- function(x, y){
  out <- t.test(x,y)
  list(
    n1 = length(x),
    n2 = length(y),
    p = out$p.value
  )
}

You can then utilize the ocpu.rpc function to call this custom function, as the list can be easily converted to JSON. Additionally, deploying your own package on the public demo server with the github webhook is a straightforward process.

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