ARTICULATION TESTING METHODS 



847 



uniform proficiency. In using the lists, the words are recorded with 

 the EngHsh spelhng. Only errors in the vowel and consonant sounds 

 of the left-hand column of the above table, are counted. Since 

 only one sound in each syllable is utilized, the above lists require a 

 somewhat greater testing time for a given precision than do the 

 standard lists where all three sounds of the syllables are used. 



Table XVIII below, shows data that were obtained with the three 

 types of lists, namely, the standard lists, the vowel consonant lists, 

 and the vowel word consonant word lists. The vowel consonant 



TABLE XVIII 

 Articulation Results with Various Lists 



lists lead to syllable articulations that are essentially the same as 

 obtained with the standard lists. It is evident from the data that 

 the word lists lead to slightly higher values of syllable articulation. 

 The explanation is to be found in the make up of the word list. It 

 was not possible to arrange the lists so that all sounds are equally 

 probable, and still use English words. For instance, an observer 

 would not record "bik" for "beck," nor "wiv" for "with," etc. 

 For this reason, the observers do not make errors which occur fre- 

 quently in the other two types of lists, where any sound is possible. 

 Hence the observed articulations are somewhat higher with the 

 word lists. 



It was found, however, that the word lists may be correlated with 

 the standard lists by means of the relation given by Equation 1. The 

 value of X for this case is 0.9 so that, the word technique may be 

 corrected to the standard technique, by means of the equation. 



5= 1 - (1 - vxjy\ (15) 



where S = syl. art. of standard lists expressed as a ratio, 



Vxc = vowel art. of vowel word lists expressed as a ratio. 

 Cio = cons. art. of cons, word list expressed as a ratio. 



The corrected values are also shown in the above table. 



