It only makes sense to hire a company where the consultant has dealt with dissertation committees (i.e., the consulting company have employees who have a doctorate degree) and has expertise in statistics (Ph.D. is preferred). Confirm their credentials—if they say they have a degree from Harvard Department of Statistics—call Harvard’s statistics department top confirm (I have a Ph.D. in Clinical Psychology from an APA-accredited program at Miami University in Oxford, Ohio).
Make sure the company is responsive, patient with answering your questions, and trust your experience with the potential company. Remember, you are the customer!
If you have questions, please feel free to call us at 877.437.8622 or visit our website at http://www.statisticssolutions.com/