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## Articles by author Nicholas J. Cox

Speaking Stata: Is a variable constant?
N. J. Cox. 2020.
Stata Journal Volume 20 Number 3.
Speaking Stata: More ways for rowwise
N. J. Cox. 2020.
Stata Journal Volume 20 Number 2.
Stata tip 138: Local macros have local scope
N. J. Cox. 2020.
Stata Journal Volume 20 Number 2.
Speaking Stata: Concatenating values over observations
N. J. Cox. 2020.
Stata Journal Volume 20 Number 1.
Speaking Stata: Some simple devices to ease the spaghetti problem
N. J. Cox. 2019.
Stata Journal Volume 19 Number 4.
Stata tip 133: Box plots that show median and quartiles only
N. J. Cox. 2019.
Stata Journal Volume 19 Number 4.
Speaking Stata: The last day of the month
N. J. Cox. 2019.
Stata Journal Volume 19 Number 3.
Stata tip 132: Tiny tricks and tips on ticks
N. J. Cox and V. Wiggins. 2019.
Stata Journal Volume 19 Number 3.
Speaking Stata: How best to generate indicator or dummy variables
N. J. Cox and C. B. Schechter. 2019.
Stata Journal Volume 19 Number 1.
Speaking Stata: Seven steps for vexatious string variables
N. J. Cox and C. B. Schechter. 2018.
Stata Journal Volume 18 Number 4.
Speaking Stata: From rounding to binning
N. J. Cox. 2018.
Stata Journal Volume 18 Number 3.
Stata tip 130: 106610 and all that: Date variables that need to be fixed
N. J. Cox. 2018.
Stata Journal Volume 18 Number 3.
Speaking Stata: Logarithmic binning and labeling
N. J. Cox. 2018.
Stata Journal Volume 18 Number 1.
Speaking Stata: Tables as lists: The groups command
N. J. Cox. 2017.
Stata Journal Volume 17 Number 3.
Speaking Stata: Letter values as selected quantiles
N. J. Cox. 2016.
Stata Journal Volume 16 Number 4.
Speaking Stata: Shading zones on time series and other plots
N. J. Cox. 2016.
Stata Journal Volume 16 Number 3.
Speaking Stata: Multiple bar charts in table form
N. J. Cox. 2016.
Stata Journal Volume 16 Number 2.
Speaking Stata: Truth, falsity, indication, and negation
N. J. Cox. 2016.
Stata Journal Volume 16 Number 1.
Speaking Stata: A set of utilities for managing missing values
N. J. Cox. 2015.
Stata Journal Volume 15 Number 4.
Speaking Stata: Species of origin
N. J. Cox. 2015.
Stata Journal Volume 15 Number 2.
Stata tip 123: Spell boundaries
N. J. Cox. 2015.
Stata Journal Volume 15 Number 1.
Speaking Stata: Design plots for graphical summary of a response given factors
N. J. Cox. 2014.
Stata Journal Volume 14 Number 4.
Stata tip 121: Box plots side by side
N. J. Cox. 2014.
Stata Journal Volume 14 Number 4.
Speaking Stata: Self and others
N. J. Cox. 2014.
Stata Journal Volume 14 Number 2.
Stata tip 119: Expanding datasets for graphical ends
N. J. Cox. 2014.
Stata Journal Volume 14 Number 1.
Speaking Stata: Trimming to taste
N. J. Cox. 2013.
Stata Journal Volume 13 Number 3.
Speaking Stata: Creating and varying box plots: Correction
N. J. Cox. 2013.
Stata Journal Volume 13 Number 2.
Stata tip 114: Expand paired dates to pairs of dates
N. J. Cox. 2013.
Stata Journal Volume 13 Number 1.
Speaking Stata: Matrices as look-up tables
N. J. Cox. 2012.
Stata Journal Volume 12 Number 4.
Stata tip 113: Changing a variable's format: What it does and does not mean
N. J. Cox. 2012.
Stata Journal Volume 12 Number 4.
Stata tip 111: More on working with weeks, erratum
N. J. Cox. 2012.
Stata Journal Volume 12 Number 4.
Speaking Stata: Axis practice, or what goes where on a graph
N. J. Cox. 2012.
Stata Journal Volume 12 Number 3.
Stata tip 111: More on working with weeks
N. J. Cox. 2012.
Stata Journal Volume 12 Number 3.
Speaking Stata: Transforming the time axis
N. J. Cox. 2012.
Stata Journal Volume 12 Number 2.
Speaking Stata: Output to order
N. J. Cox. 2012.
Stata Journal Volume 12 Number 1.
Stata tip 105: Daily dates with missing days
S. J. Samuels and N. J. Cox. 2012.
Stata Journal Volume 12 Number 1.
Stata tip 104: Added text and title options
N. J. Cox. 2011.
Stata Journal Volume 11 Number 4.
Speaking Stata: Fun and fluency with functions
N. J. Cox. 2011.
Stata Journal Volume 11 Number 3.
Stata tip 101: Previous but different
N. J. Cox. 2011.
Stata Journal Volume 11 Number 3.
Stata tip 102: Highlighting specific bars
N. J. Cox. 2011.
Stata Journal Volume 11 Number 3.
Speaking Stata: Compared with ...
N. J. Cox. 2011.
Stata Journal Volume 11 Number 2.
Stata tip 98: Counting substrings within strings
N. J. Cox. 2011.
Stata Journal Volume 11 Number 2.
Stata tip 100: Mata and the case of the missing macros
W. Gould and N. J. Cox. 2011.
Stata Journal Volume 11 Number 2.
Speaking Stata: MMXI and all that: Handling Roman numerals within Stata
N. J. Cox. 2011.
Stata Journal Volume 11 Number 1.
Stata tip 96: Cube roots
N. J. Cox. 2011.
Stata Journal Volume 11 Number 1.
Speaking Stata: Graphing subsets
N. J. Cox. 2010.
Stata Journal Volume 10 Number 4.
Stata tip 68: Week assumptions
N. J. Cox. 2010.
Stata Journal Volume 10 Number 4.
Speaking Stata: The limits of sample skewness and kurtosis
N. J. Cox. 2010.
Stata Journal Volume 10 Number 3.
Stata tip 91: Putting unabbreviated varlists into local macros
N. J. Cox. 2010.
Stata Journal Volume 10 Number 3.
Speaking Stata: Finding variables
N. J. Cox. 2010.
Stata Journal Volume 10 Number 2.
A conversation with Kit Baum
N. J. Cox. 2010.
Stata Journal Volume 10 Number 1.
Speaking Stata: The statsby strategy
N. J. Cox. 2010.
Stata Journal Volume 10 Number 1.
Stata tip 84: Summing missings
N. J. Cox. 2010.
Stata Journal Volume 10 Number 1.
Stata tip 85: Looping over nonintegers
N. J. Cox. 2010.
Stata Journal Volume 10 Number 1.
Speaking Stata: Paired, parallel, or profile plots for changes, correlations, and other comparisons
N. J. Cox. 2009.
Stata Journal Volume 9 Number 4.
Stata tip 82: Grounds for grids on graphs
N. J. Cox. 2009.
Stata Journal Volume 9 Number 4.
Speaking Stata: Creating and varying box plots
N. J. Cox. 2009.
Stata Journal Volume 9 Number 3.
Stata tip 78: Going gray gracefully: Highlighting subsets and downplaying substrates
N. J. Cox. 2009.
Stata Journal Volume 9 Number 3.
Stata tip 79: Optional arguments to options
N. J. Cox. 2009.
Stata Journal Volume 9 Number 3.
Speaking Stata: I. J. Good and quasi–Bayes smoothing of categorical frequencies
N. J. Cox. 2009.
Stata Journal Volume 9 Number 2.
Stata tip 76: Separating seasonal time series
N. J. Cox. 2009.
Stata Journal Volume 9 Number 2.
Speaking Stata: Rowwise
N. J. Cox. 2009.
Stata Journal Volume 9 Number 1.
Speaking Stata: Distinct observations
N. J. Cox and G. M. Longton. 2008.
Stata Journal Volume 8 Number 4.
Stata tip 70: Beware the evaluating equal sign
N. J. Cox. 2008.
Stata Journal Volume 8 Number 4.
Stata tip 71: The problem of split identity, or how to group dyads
N. J. Cox. 2008.
Stata Journal Volume 8 Number 4.
Speaking Stata: Correlation with confidence, or Fisher's z revisited
N. J. Cox. 2008.
Stata Journal Volume 8 Number 3.
Stata tip 65: Beware the backstabbing backslash
N. J. Cox. 2008.
Stata Journal Volume 8 Number 3.
Stata tip 67: J() now has greater replicating powers
N. J. Cox. 2008.
Stata Journal Volume 8 Number 3.
Speaking Stata: Between tables and graphs
N. J. Cox. 2008.
Stata Journal Volume 8 Number 2.
Stata tip 61: Decimal commas in results output and data input
N. J. Cox. 2008.
Stata Journal Volume 8 Number 2.
Stata tip 62: Plotting on reversed scales
N. J. Cox and N. L. M. Barlow. 2008.
Stata Journal Volume 8 Number 2.
Speaking Stata: Spineplots and their kin
N. J. Cox. 2008.
Stata Journal Volume 8 Number 1.
Stata tip 59: Plotting on any transformed scale
N. J. Cox. 2008.
Stata Journal Volume 8 Number 1.
Speaking Stata: Counting groups, especially panels
N. J. Cox. 2007.
Stata Journal Volume 7 Number 4.
Stata tip 52: Generating composite categorical variables
N. J. Cox. 2007.
Stata Journal Volume 7 Number 4.
Stata tip 55: Better axis labeling for time points and time intervals
N. J. Cox. 2007.
Stata Journal Volume 7 Number 4.
Speaking Stata: Turning over a new leaf
N. J. Cox. 2007.
Stata Journal Volume 7 Number 3.
Stata tip 50: Efficient use of summarize
N. J. Cox. 2007.
Stata Journal Volume 7 Number 3.
Stata tip 51: Events in intervals
N. J. Cox. 2007.
Stata Journal Volume 7 Number 3.
Speaking Stata: Identifying spells
N. J. Cox. 2007.
Stata Journal Volume 7 Number 2.
Stata tip 45: Getting those data into shape
C. F. Baum and N. J. Cox. 2007.
Stata Journal Volume 7 Number 2.
Stata tip 47: Quantile–quantile plots without programming
N. J. Cox. 2007.
Stata Journal Volume 7 Number 2.
Speaking Stata: Making it count
N. J. Cox. 2007.
Stata Journal Volume 7 Number 1.
Stata tip 43: Remainders, selections, sequences, extractions: Uses of the modulus
N. J. Cox. 2007.
Stata Journal Volume 7 Number 1.
Speaking Stata: In praise of trigonometric predictors
N. J. Cox. 2006.
Stata Journal Volume 6 Number 4.
Stata tip 39: In a list or out? In a range or out?
N. J. Cox. 2006.
Stata Journal Volume 6 Number 4.
Stata tip 36: Which observations? Erratum
N. J. Cox. 2006.
Stata Journal Volume 6 Number 4.
Speaking Stata: Graphs for all seasons
N. J. Cox. 2006.
Stata Journal Volume 6 Number 3.
Stata tip 36: Which observations?
N. J. Cox. 2006.
Stata Journal Volume 6 Number 3.
Stata tip 33: Sweet sixteen: Hexadecimal formats and precision problems
N. J. Cox. 2006.
Stata Journal Volume 6 Number 2.
Speaking Stata: Time of day
N. J. Cox. 2006.
Stata Journal Volume 6 Number 1.
Stata tip 30: May the source be with you
N. J. Cox. 2006.
Stata Journal Volume 6 Number 1.
Suggestions on Stata programming style
N. J. Cox. 2005.
Stata Journal Volume 5 Number 4.
Speaking Stata: Smoothing in various directions
N. J. Cox. 2005.
Stata Journal Volume 5 Number 4.
Stata tip 27: Classifying data points on scatter plots
N. J. Cox. 2005.
Stata Journal Volume 5 Number 4.
A multivariable scatterplot smoother
P. Royston and N. J. Cox. 2005.
Stata Journal Volume 5 Number 3.
Depending on conditions: a tutorial on the cond() function
D. Kantor and N. J. Cox. 2005.
Stata Journal Volume 5 Number 3.
Speaking Stata: The protean quantile plot
N. J. Cox. 2005.
Stata Journal Volume 5 Number 3.
Stata tip 24: Axis labels on two or more levels
N. J. Cox. 2005.
Stata Journal Volume 5 Number 3.
Speaking Stata: Density probability plots
N. J. Cox. 2005.
Stata Journal Volume 5 Number 2.
Stata tip 21: The arrows of outrageous fortune
N. J. Cox. 2005.
Stata Journal Volume 5 Number 2.
A brief history of Stata on its 20th anniversary
N. J. Cox. 2005.
Stata Journal Volume 5 Number 1.
Stata tip 17: Filling in the gaps
N. J. Cox. 2005.
Stata Journal Volume 5 Number 1.
Speaking Stata: Graphing model diagnostics
N. J. Cox. 2004.
Stata Journal Volume 4 Number 4.
Review of Statistical Evaluation of Measurement Errors by Dunn
N. J. Cox. 2004.
Stata Journal Volume 4 Number 4.
Stata tip 15: Function graphs on the fly
N. J. Cox. 2004.
Stata Journal Volume 4 Number 4.
Speaking Stata: Graphing agreement and disagreement
N. J. Cox. 2004.
Stata Journal Volume 4 Number 3.
Stata tip 12: Tuning the plot region aspect ratio
N. J. Cox. 2004.
Stata Journal Volume 4 Number 3.
Speaking Stata: Graphing categorical and compositional data
N. J. Cox. 2004.
Stata Journal Volume 4 Number 2.
Stata tip 9: Following special sequences
N. J. Cox. 2004.
Stata Journal Volume 4 Number 2.
Speaking Stata: Graphing distributions
N. J. Cox. 2004.
Stata Journal Volume 4 Number 1.
Stata tip 6: Inserting awkward characters in the plot
N. J. Cox. 2004.
Stata Journal Volume 4 Number 1.
Speaking Stata: Problems with tables, Part II
N. J. Cox. 2003.
Stata Journal Volume 3 Number 4.
Stata tip 2: Building with floors and ceilings
N. J. Cox. 2003.
Stata Journal Volume 3 Number 4.
Do–it–yourself shuffling and the number of runs under randomness
N. Smeeton and N. J. Cox. 2003.
Stata Journal Volume 3 Number 3.
Speaking Stata: Problems with tables, Part I
N. J. Cox. 2003.
Stata Journal Volume 3 Number 3.
The Stata Journal so far: Editors' report
H. J. Newton and N. J. Cox. 2003.
Stata Journal Volume 3 Number 2.
Speaking Stata: Problems with lists
N. J. Cox. 2003.
Stata Journal Volume 3 Number 2.
Speaking Stata: On structure and shape: the case of multiple responses
N. J. Cox and U. Kohler. 2003.
Stata Journal Volume 3 Number 1.
Speaking Stata: On getting functions to do the work
N. J. Cox. 2002.
Stata Journal Volume 2 Number 4.
Speaking Stata: On numbers and strings
N. J. Cox. 2002.
Stata Journal Volume 2 Number 3.
A note on the concordance correlation coefficient
T. J. Steichen and N. J. Cox. 2002.
Stata Journal Volume 2 Number 2.
Speaking Stata: How to face lists with fortitude
N. J. Cox. 2002.
Stata Journal Volume 2 Number 2.
Speaking Stata: How to move step by: step
N. J. Cox. 2002.
Stata Journal Volume 2 Number 1.
Speaking Stata: How to repeat yourself without going mad
N. J. Cox. 2001.
Stata Journal Volume 1 Number 1.