This application sets up a webservice for using CAT to determine question ordering on a survey.
It is configured to run on heroku.com and scale using their web workers.
This takes a cat object and returns the item with the lowest EVP. It also returns the EVP for all items in case the user wants them.
All the parameters that are normally in a R cat object can be set here
https://dynadas-rookv2.herokuapp.com/next_question
POST
None
{
"guessing":[
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"discrimination":{
"NFC1":-1.745,
"NFC40":-1.774,
"NFC29":2.554,
"NFC32":2.771,
"NFC23":2.919,
"NFC33":2.329,
"NFC24":1.829,
"NFC19":1.922,
"NFC22":1.166,
"NFC21":1.563,
"NFC15":-0.337,
"NFC10":1.959,
"NFC39":-1.348,
"NFC16":-0.308,
"NFC4":-1.609,
"NFC31":1.445,
"NFC43":1.385,
"NFC12":-0.696
},
"answers":[
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA"
],
"priorName":"normal",
"priorParams":[
0,
1
],
"lowerBound":-4.5,
"upperBound":4.5,
"quadPoints":43,
"D":1,
"X":[
-4.5,
-4.28571428571429,
-4.07142857142857,
-3.85714285714286,
-3.64285714285714,
-3.42857142857143,
-3.21428571428571,
-3,
-2.78571428571429,
-2.57142857142857,
-2.35714285714286,
-2.14285714285714,
-1.92857142857143,
-1.71428571428571,
-1.5,
-1.28571428571429,
-1.07142857142857,
-0.857142857142857,
-0.642857142857143,
-0.428571428571429,
-0.214285714285714,
0,
0.214285714285714,
0.428571428571428,
0.642857142857142,
0.857142857142857,
1.07142857142857,
1.28571428571429,
1.5,
1.71428571428571,
1.92857142857143,
2.14285714285714,
2.35714285714286,
2.57142857142857,
2.78571428571429,
3,
3.21428571428571,
3.42857142857143,
3.64285714285714,
3.85714285714286,
4.07142857142857,
4.28571428571428,
4.5
],
"Theta.est":[
],
"difficulty":{
"NFC1":{
"Extrmt1":0.752,
"Extrmt2":-1.01,
"Extrmt3":-1.959,
"Extrmt4":-2.985
},
"NFC40":{
"Extrmt1":1.706,
"Extrmt2":0.297,
"Extrmt3":-0.946,
"Extrmt4":-2.533
},
"NFC29":{
"Extrmt1":-2.371,
"Extrmt2":-1.25,
"Extrmt3":-0.517,
"Extrmt4":1.013
},
"NFC32":{
"Extrmt1":-2.159,
"Extrmt2":-1.337,
"Extrmt3":-0.569,
"Extrmt4":0.82
},
"NFC23":{
"Extrmt1":-2.002,
"Extrmt2":-1.1,
"Extrmt3":-0.431,
"Extrmt4":1.07
},
"NFC33":{
"Extrmt1":-2.312,
"Extrmt2":-1.308,
"Extrmt3":-0.588,
"Extrmt4":1.002
},
"NFC24":{
"Extrmt1":-2.234,
"Extrmt2":-0.831,
"Extrmt3":-0.002,
"Extrmt4":1.676
},
"NFC19":{
"Extrmt1":-2.415,
"Extrmt2":-0.997,
"Extrmt3":-0.39,
"Extrmt4":1.229
},
"NFC22":{
"Extrmt1":-3.022,
"Extrmt2":-0.827,
"Extrmt3":0.388,
"Extrmt4":2.595
},
"NFC21":{
"Extrmt1":-2.285,
"Extrmt2":-0.601,
"Extrmt3":0.306,
"Extrmt4":1.993
},
"NFC15":{
"Extrmt1":5.057,
"Extrmt2":1.273,
"Extrmt3":-1.232,
"Extrmt4":-6.28
},
"NFC10":{
"Extrmt1":-2.581,
"Extrmt2":-1.492,
"Extrmt3":-0.743,
"Extrmt4":0.944
},
"NFC39":{
"Extrmt1":2.192,
"Extrmt2":0.39,
"Extrmt3":-0.91,
"Extrmt4":-2.704
},
"NFC16":{
"Extrmt1":5.682,
"Extrmt2":1.274,
"Extrmt3":-1.505,
"Extrmt4":-7.205
},
"NFC4":{
"Extrmt1":1.168,
"Extrmt2":-0.371,
"Extrmt3":-1.372,
"Extrmt4":-2.867
},
"NFC31":{
"Extrmt1":-2.162,
"Extrmt2":-0.718,
"Extrmt3":0.174,
"Extrmt4":2.117
},
"NFC43":{
"Extrmt1":-2.989,
"Extrmt2":-1.435,
"Extrmt3":-0.586,
"Extrmt4":1.498
},
"NFC12":{
"Extrmt1":3.006,
"Extrmt2":-0.442,
"Extrmt3":-1.856,
"Extrmt4":-4.907
}
},
"poly":true,
"integration":"trapezoid",
"estimation":"EAP",
"selection":"EPV",
"coverage":0.9,
"points":40
}{
"next_item": 5,
"epvs": [
0.5629693465795451,
0.5238134518329086,
0.39197708840703016,
0.35918581634833574,
0.34371834209844576,
0.42968859404758686,
0.5131887923415044,
0.499053368571471,
0.7118729298376328,
0.581221599257183,
0.9652234287029428,
0.5045852891649568,
0.6483211716625897,
0.9708166393896972,
0.5732221068571528,
0.6182754021577043,
0.6505338737566538,
0.8744107565544134
]
}This returns the possible next items depending on what the user answers.
https://dynadas-rookv2.herokuapp.com/look_ahead
POST
None
this_item: the current index of the question the user is about to answercat: the cat object (as would be provided innext_item)
{
"this_item":1,
"cat":{
"guessing":[
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"discrimination":{
"NFC1":-1.745,
"NFC40":-1.774,
"NFC29":2.554,
"NFC32":2.771,
"NFC23":2.919,
"NFC33":2.329,
"NFC24":1.829,
"NFC19":1.922,
"NFC22":1.166,
"NFC21":1.563,
"NFC15":-0.337,
"NFC10":1.959,
"NFC39":-1.348,
"NFC16":-0.308,
"NFC4":-1.609,
"NFC31":1.445,
"NFC43":1.385,
"NFC12":-0.696
},
"answers":[
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA",
"NA"
],
"priorName":"normal",
"priorParams":[
0,
1
],
"lowerBound":-4.5,
"upperBound":4.5,
"quadPoints":43,
"D":1,
"X":[
-4.5,
-4.28571428571429,
-4.07142857142857,
-3.85714285714286,
-3.64285714285714,
-3.42857142857143,
-3.21428571428571,
-3,
-2.78571428571429,
-2.57142857142857,
-2.35714285714286,
-2.14285714285714,
-1.92857142857143,
-1.71428571428571,
-1.5,
-1.28571428571429,
-1.07142857142857,
-0.857142857142857,
-0.642857142857143,
-0.428571428571429,
-0.214285714285714,
0,
0.214285714285714,
0.428571428571428,
0.642857142857142,
0.857142857142857,
1.07142857142857,
1.28571428571429,
1.5,
1.71428571428571,
1.92857142857143,
2.14285714285714,
2.35714285714286,
2.57142857142857,
2.78571428571429,
3,
3.21428571428571,
3.42857142857143,
3.64285714285714,
3.85714285714286,
4.07142857142857,
4.28571428571428,
4.5
],
"Theta.est":[
],
"difficulty":{
"NFC1":{
"Extrmt1":0.752,
"Extrmt2":-1.01,
"Extrmt3":-1.959,
"Extrmt4":-2.985
},
"NFC40":{
"Extrmt1":1.706,
"Extrmt2":0.297,
"Extrmt3":-0.946,
"Extrmt4":-2.533
},
"NFC29":{
"Extrmt1":-2.371,
"Extrmt2":-1.25,
"Extrmt3":-0.517,
"Extrmt4":1.013
},
"NFC32":{
"Extrmt1":-2.159,
"Extrmt2":-1.337,
"Extrmt3":-0.569,
"Extrmt4":0.82
},
"NFC23":{
"Extrmt1":-2.002,
"Extrmt2":-1.1,
"Extrmt3":-0.431,
"Extrmt4":1.07
},
"NFC33":{
"Extrmt1":-2.312,
"Extrmt2":-1.308,
"Extrmt3":-0.588,
"Extrmt4":1.002
},
"NFC24":{
"Extrmt1":-2.234,
"Extrmt2":-0.831,
"Extrmt3":-0.002,
"Extrmt4":1.676
},
"NFC19":{
"Extrmt1":-2.415,
"Extrmt2":-0.997,
"Extrmt3":-0.39,
"Extrmt4":1.229
},
"NFC22":{
"Extrmt1":-3.022,
"Extrmt2":-0.827,
"Extrmt3":0.388,
"Extrmt4":2.595
},
"NFC21":{
"Extrmt1":-2.285,
"Extrmt2":-0.601,
"Extrmt3":0.306,
"Extrmt4":1.993
},
"NFC15":{
"Extrmt1":5.057,
"Extrmt2":1.273,
"Extrmt3":-1.232,
"Extrmt4":-6.28
},
"NFC10":{
"Extrmt1":-2.581,
"Extrmt2":-1.492,
"Extrmt3":-0.743,
"Extrmt4":0.944
},
"NFC39":{
"Extrmt1":2.192,
"Extrmt2":0.39,
"Extrmt3":-0.91,
"Extrmt4":-2.704
},
"NFC16":{
"Extrmt1":5.682,
"Extrmt2":1.274,
"Extrmt3":-1.505,
"Extrmt4":-7.205
},
"NFC4":{
"Extrmt1":1.168,
"Extrmt2":-0.371,
"Extrmt3":-1.372,
"Extrmt4":-2.867
},
"NFC31":{
"Extrmt1":-2.162,
"Extrmt2":-0.718,
"Extrmt3":0.174,
"Extrmt4":2.117
},
"NFC43":{
"Extrmt1":-2.989,
"Extrmt2":-1.435,
"Extrmt3":-0.586,
"Extrmt4":1.498
},
"NFC12":{
"Extrmt1":3.006,
"Extrmt2":-0.442,
"Extrmt3":-1.856,
"Extrmt4":-4.907
}
},
"poly":true,
"integration":"trapezoid",
"estimation":"EAP",
"selection":"EPV",
"coverage":0.9,
"points":40
}
}{
"next_items": [
5,
5,
5,
5,
5
]
}