IUI requires ovulation, at least one open fallopian tube, and a semen sample with healthy sperm. Each IUI treatment is referred to as a cycle â the time from the first day of your period to ovulation and insemination and then a pregnancy test two weeks later.
Total survey error - Sources of nonsampling error. 1  The survey literature decomposes nonsampling errors into five general sources or types: specification error, frame error, nonresponse error, measurement error, and processing error. Specification error occurs when the concept implied by the survey question differs from the concept meant to be measured in the survey.
Two types of errors are defined in order to help organize the contributors to the discrepancy between the final measured value and the accepted or known value: systematic errors and random errors. Systematic errors: These are errors which affect all measurements alike, and which can be traced to an imperfectly made instrument or to the personal technique and bias of the observer.