Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Running examples in ‘irtProb-Ex.R’ failed
The error most likely occurred in:

> ### Name: conversion
> ### Title: Functions to Convert from and to CTT and IRT Models
> ### Aliases: ctt2irt irt2ctt
> ### Keywords: distribution
> 
> ### ** Examples
> 
> ## ....................................................................
> # Values of p and rbis according to de a, b, c and d values
> #  MODEL means that item parameters are from a NORMAL or LOGISTIC model
> #  type
>  irt2ctt()
     rpbis difficulty 
 0.8621946  0.5000000 
>  nItems <- 5
>  b      <-  seq(-3, 3, length=nItems)
>  a      <-  rep(1, nItems)
>  c      <-  rep(0, nItems)
>  d      <-  rep(1, nItems)
>  
> # Difference between classical item parameters and IRT ones
>  irt2ctt(b=b,a=a,c=c,d=d,model="LOGISTIC")
Error in c > 0 || d < 1 : 'length = 5' in coercion to 'logical(1)'
Calls: irt2ctt
Execution halted
Malformed Description field: should contain one or more complete sentences.
Running examples in ‘irtProb-Ex.R’ failed
The error most likely occurred in:

> ### Name: conversion
> ### Title: Functions to Convert from and to CTT and IRT Models
> ### Aliases: ctt2irt irt2ctt
> ### Keywords: distribution
> 
> ### ** Examples
> 
> ## ....................................................................
> # Values of p and rbis according to de a, b, c and d values
> #  MODEL means that item parameters are from a NORMAL or LOGISTIC model
> #  type
>  irt2ctt()
     rpbis difficulty 
 0.8621946  0.5000000 
>  nItems <- 5
>  b      <-  seq(-3, 3, length=nItems)
>  a      <-  rep(1, nItems)
>  c      <-  rep(0, nItems)
>  d      <-  rep(1, nItems)
>  
> # Difference between classical item parameters and IRT ones
>  irt2ctt(b=b,a=a,c=c,d=d,model="LOGISTIC")
Error in c > 0 || d < 1 : 'length = 5' in coercion to 'logical(1)'
Calls: irt2ctt
Execution halted
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.
Malformed Description field: should contain one or more complete sentences.