Statistical analysis involves calculations, and a quality calculator like this comes in handy. It will abate his numerous computations in various aspects such as pension calculations. With this gift, you will show that you approve the work done, and willing to reciprocate, albeit minutely. Present your present to express your gratitude. It will motivate him/her, and what more contentment does a competent statistician get, than from acknowledgment of his/her work, apart from his/her salary? Your gift expresses exactly that.