On average, across the surveys, around 2% of scientists admitted they
had 'fabricated' (made up), 'falsified' or 'altered' data to 'improve
the outcome' at least once, and up to 34% admitted to other questionable
research practices including 'failing to present data that contradict
one's own previous research' and 'dropping observations or data points
from analyses based on a gut feeling that they were inaccurate.'

http://www.sciencecentric.com/news/a...lsify-research