PNN biostatistics
Mode - ✔️✔️Entry that occurs most frequently
Range - ✔️✔️Interval between the lowest and highest number in your data data
Variance - ✔️✔️a measure of difference, or spread
standard deviation - ✔️✔️the square root of the variance
Normal distributions (bell shaped distribution) - ✔️✔️68% of population will be in the
range from -1SD to +1SD
95% of the population will fall in the range from -2SD to +2SD
Estimating the strength of correlation - ✔️✔️RR, RRR, AR, NNT, OR
Measure of central tendency - ✔️✔️-mean, median, mode
- each provides a different central point of collected data
Mean - ✔️✔️-Average of all the numbers in the data
- used for CONTINUOUS data
-reliable measure of central tendency unless there is an EXTREME OUTLIER that
throws off the mean from the central location of the data
Median - ✔️✔️-middle value in the set of data
-sort the list from lowest to highest
- if the number of values in the collected data is an even number, then the median is
equal to the sum of the two middle numbers divided by 2
- generally used for ORDINAL DATA
- is reliable when there are extreme outliers
Risk - ✔️✔️(# of subjects in the group with unfavorable event) / (total number of
subjects in the group)
Relative Risk (RR) - ✔️✔️(Risk in the treatment group)/ (risk in the control group)
- have to calculate risk 1st
- AS likely
Mode - ✔️✔️Entry that occurs most frequently
Range - ✔️✔️Interval between the lowest and highest number in your data data
Variance - ✔️✔️a measure of difference, or spread
standard deviation - ✔️✔️the square root of the variance
Normal distributions (bell shaped distribution) - ✔️✔️68% of population will be in the
range from -1SD to +1SD
95% of the population will fall in the range from -2SD to +2SD
Estimating the strength of correlation - ✔️✔️RR, RRR, AR, NNT, OR
Measure of central tendency - ✔️✔️-mean, median, mode
- each provides a different central point of collected data
Mean - ✔️✔️-Average of all the numbers in the data
- used for CONTINUOUS data
-reliable measure of central tendency unless there is an EXTREME OUTLIER that
throws off the mean from the central location of the data
Median - ✔️✔️-middle value in the set of data
-sort the list from lowest to highest
- if the number of values in the collected data is an even number, then the median is
equal to the sum of the two middle numbers divided by 2
- generally used for ORDINAL DATA
- is reliable when there are extreme outliers
Risk - ✔️✔️(# of subjects in the group with unfavorable event) / (total number of
subjects in the group)
Relative Risk (RR) - ✔️✔️(Risk in the treatment group)/ (risk in the control group)
- have to calculate risk 1st
- AS likely
