ABC of computing. Statistics and epidemiology.

>30 records N BMJ. The doctor must understand why statistics are used before he starts. The central concept to grasp is that of variability in results. Secondly, v having further defined his problems the doctor should then consult a statistician, preferably one with experience of computers. The statistician will be able to advise on experimental design, the most suitable forms of statistical analysis, and, most important, the volume of data that may have to be collected to show any significant result. This is a crucial step and ,,Will a micro be able allows one to make decisions on how to handle the data. N to manage ? > If there is a small amount of data-for example, up to 30 records each of memory containing five pieces of information-and a simple analysis is appropriate y then this can reasonably be undertaken with a simple desk top calculator. The cost in money and temper in entering 150 numbers via a keyboard should not, however, be underestimated. Invariably there will be mistakes and the data will have to be corrected. If, however, a more advanced form of analysis is needed then even this small amount of information may prove to be too much and the use of a computer package should be considered. One possibility is to use a