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PPVT-R is quick and easy to administer because only those items between the child's basal and ceiling level are administered. The instrument also can be scored rapidly. The raw scores are then converted to standard scores with a mean of 100 and standard deviation of 15.
The PPVT-R was standardized on 4,200 children between the ages of 2 1/2 and 18 years old, with 100 children of each sex at each age level (Dunn & Dunn, 1981). The sample of children approximated the 1970 U. S. census data for sex, age, geographic location, occupational background, racial/ethnic and urban/rural population distributions. Internal consistency coefficients of the PPVT-R, Form L, ranged from .67 to .88, based on split-half reliability procedures. Test-retest reliability coefficients for standard scores ranged from .54 to .90, with a median value of .77. Test-retest reliability was evaluated on a subsample of 962 children with the retest interval ranging from 9 to 31 days. Although the PPVT-R scores should not be interpreted as intelligence scores, IQ scores and PPVT-R scores have been found to be correlated between .40 and .60. Measures for Assessing Clinic and Home Behavior The Eyberg Child Behavior Inventory (ECBI; Eyberg & Pincus, 1999)
The ECBI consists of 36 items describing typical problem behaviors for children. Parents rate the frequency with which these behaviors occur on a scale of 1 (never occurs) to 7 (always occurs). An intensity score, ranging from 36 to 252, may be derived by summing these ratings. A problem score, ranging from 0 to 36, is derived by summing the number of child behaviors deemed problematic by the parent.