Statistics most important details
Cheatsheat
Descriptive Difference Relations
statistics
Nominal Mode X2
Ordinal Median, range X2
Scale or Mean, stdev T-test Correlation,
Interval / ratio regression
P <..05 significant
P is smaller than 5% = significant
P is bigger than 5% = not significant
Descriptive statistics
1. Measure of centre
Mode: most frequently observed value
Median: mid-point – 50/50 (rank order your data)
Mean: average
Standard deviation: describes variation of a distribution, these two numbers describe /
summarize a group of data
T-test: difference between 2 groups
Chi square: relationship
Correlation: relationship
Regression: prediction
2. Measure of spread
Range: lowest – the highest value ordinal
ST Dev scale
Measurement levels:
Nominal: labels – variable with values with no numerical value (gender)
Ordinal: Ranking (star rating)
Scale: Same distance between number. (Age, length, income)
Scale is also interval / ratio: Same distance between number.
Ratio has a zero point
Categorial: nominal, ordinal
Numerical: interval, ratio
Cheatsheat
Descriptive Difference Relations
statistics
Nominal Mode X2
Ordinal Median, range X2
Scale or Mean, stdev T-test Correlation,
Interval / ratio regression
P <..05 significant
P is smaller than 5% = significant
P is bigger than 5% = not significant
Descriptive statistics
1. Measure of centre
Mode: most frequently observed value
Median: mid-point – 50/50 (rank order your data)
Mean: average
Standard deviation: describes variation of a distribution, these two numbers describe /
summarize a group of data
T-test: difference between 2 groups
Chi square: relationship
Correlation: relationship
Regression: prediction
2. Measure of spread
Range: lowest – the highest value ordinal
ST Dev scale
Measurement levels:
Nominal: labels – variable with values with no numerical value (gender)
Ordinal: Ranking (star rating)
Scale: Same distance between number. (Age, length, income)
Scale is also interval / ratio: Same distance between number.
Ratio has a zero point
Categorial: nominal, ordinal
Numerical: interval, ratio
