Reliability APM linkedin Reasoning Crystallized Age cognitive ability JCCES WAIS CCAT Gifted EPC Correlation Analogies C-10 Knowledge SAT Sequences MDS Intelligence CFIT test publisher Factor Language g human intelligence group differences IQ Rasch psychometric HAC Mathematical intelligence test RIAS Vocabulary JCTI Correlations TRI52 ECPA WISC Contest Verbal Lynn Fluid Cerebrals